diff --git a/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem.meta b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem.meta
new file mode 100644
index 0000000..cff102c
--- /dev/null
+++ b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem.meta	
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: ccb22c5c90bfe2f43a0f83f873dd6646
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/ByteGameFileSystem.cs b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/ByteGameFileSystem.cs
new file mode 100644
index 0000000..db00534
--- /dev/null
+++ b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/ByteGameFileSystem.cs	
@@ -0,0 +1,219 @@
+#if UNITY_WEBGL
+using System.Collections.Generic;
+using UnityEngine;
+using YooAsset;
+using StarkSDKSpace;
+
+public static class ByteGameFileSystemCreater
+{
+    public static FileSystemParameters CreateWechatFileSystemParameters(IRemoteServices remoteServices)
+    {
+        string fileSystemClass = $"{nameof(ByteGameFileSystem)},YooAsset.RuntimeExtension";
+        var fileSystemParams = new FileSystemParameters(fileSystemClass, null);
+        fileSystemParams.AddParameter("REMOTE_SERVICES", remoteServices);
+        return fileSystemParams;
+    }
+}
+
+/// <summary>
+/// 抖音小游戏文件系统
+/// 参考：https://developer.open-douyin.com/docs/resource/zh-CN/mini-game/develop/guide/know
+/// </summary>
+internal class ByteGameFileSystem : IFileSystem
+{
+    private class WebRemoteServices : IRemoteServices
+    {
+        private readonly string _webPackageRoot;
+        protected readonly Dictionary<string, string> _mapping = new Dictionary<string, string>(10000);
+
+        public WebRemoteServices(string buildinPackRoot)
+        {
+            _webPackageRoot = buildinPackRoot;
+        }
+        string IRemoteServices.GetRemoteMainURL(string fileName)
+        {
+            return GetFileLoadURL(fileName);
+        }
+        string IRemoteServices.GetRemoteFallbackURL(string fileName)
+        {
+            return GetFileLoadURL(fileName);
+        }
+
+        private string GetFileLoadURL(string fileName)
+        {
+            if (_mapping.TryGetValue(fileName, out string url) == false)
+            {
+                string filePath = PathUtility.Combine(_webPackageRoot, fileName);
+                url = DownloadSystemHelper.ConvertToWWWPath(filePath);
+                _mapping.Add(fileName, url);
+            }
+            return url;
+        }
+    }
+
+    private readonly Dictionary<string, string> _cacheFilePaths = new Dictionary<string, string>(10000);
+    private StarkFileSystemManager _fileSystemManager;
+
+    /// <summary>
+    /// 包裹名称
+    /// </summary>
+    public string PackageName { private set; get; }
+
+    /// <summary>
+    /// 文件根目录
+    /// </summary>
+    public string FileRoot
+    {
+        get
+        {
+            return string.Empty;
+        }
+    }
+
+    /// <summary>
+    /// 文件数量
+    /// </summary>
+    public int FileCount
+    {
+        get
+        {
+            return 0;
+        }
+    }
+
+    #region 自定义参数
+    /// <summary>
+    /// 自定义参数：远程服务接口
+    /// </summary>
+    public IRemoteServices RemoteServices { private set; get; } = null;
+    #endregion
+
+
+    public ByteGameFileSystem()
+    {
+    }
+    public virtual FSInitializeFileSystemOperation InitializeFileSystemAsync()
+    {
+        var operation = new BGFSInitializeOperation(this);
+        OperationSystem.StartOperation(PackageName, operation);
+        return operation;
+    }
+    public virtual FSLoadPackageManifestOperation LoadPackageManifestAsync(string packageVersion, int timeout)
+    {
+        var operation = new BGFSLoadPackageManifestOperation(this, packageVersion, timeout);
+        OperationSystem.StartOperation(PackageName, operation);
+        return operation;
+    }
+    public virtual FSRequestPackageVersionOperation RequestPackageVersionAsync(bool appendTimeTicks, int timeout)
+    {
+        var operation = new BGFSRequestPackageVersionOperation(this, timeout);
+        OperationSystem.StartOperation(PackageName, operation);
+        return operation;
+    }
+    public virtual FSClearAllBundleFilesOperation ClearAllBundleFilesAsync()
+    {
+        var operation = new FSClearAllBundleFilesCompleteOperation();
+        OperationSystem.StartOperation(PackageName, operation);
+        return operation;
+    }
+    public virtual FSClearUnusedBundleFilesOperation ClearUnusedBundleFilesAsync(PackageManifest manifest)
+    {
+        var operation = new FSClearUnusedBundleFilesCompleteOperation();
+        OperationSystem.StartOperation(PackageName, operation);
+        return operation;
+    }
+    public virtual FSDownloadFileOperation DownloadFileAsync(PackageBundle bundle, DownloadParam param)
+    {
+        param.MainURL = RemoteServices.GetRemoteMainURL(bundle.FileName);
+        param.FallbackURL = RemoteServices.GetRemoteFallbackURL(bundle.FileName);
+        var operation = new BGFSDownloadFileOperation(this, bundle, param);
+        OperationSystem.StartOperation(PackageName, operation);
+        return operation;
+    }
+    public virtual FSLoadBundleOperation LoadBundleFile(PackageBundle bundle)
+    {
+        var operation = new BGFSLoadBundleOperation(this, bundle);
+        OperationSystem.StartOperation(PackageName, operation);
+        return operation;
+    }
+    public virtual void UnloadBundleFile(PackageBundle bundle, object result)
+    {
+        AssetBundle assetBundle = result as AssetBundle;
+        if (assetBundle != null)
+            assetBundle.Unload(true);
+    }
+
+    public virtual void SetParameter(string name, object value)
+    {
+        if (name == "REMOTE_SERVICES")
+        {
+            RemoteServices = (IRemoteServices)value;
+        }
+        else
+        {
+            YooLogger.Warning($"Invalid parameter : {name}");
+        }
+    }
+    public virtual void OnCreate(string packageName, string rootDirectory)
+    {
+        PackageName = packageName;
+
+        // 注意：CDN服务未启用的情况下，使用抖音WEB服务器
+        if (RemoteServices == null)
+        {
+            string webRoot = PathUtility.Combine(Application.streamingAssetsPath, YooAssetSettingsData.Setting.DefaultYooFolderName, packageName);
+            RemoteServices = new WebRemoteServices(webRoot);
+        }
+
+        _fileSystemManager = StarkSDK.API.GetStarkFileSystemManager();
+    }
+    public virtual void OnUpdate()
+    {
+    }
+
+    public virtual bool Belong(PackageBundle bundle)
+    {
+        return true;
+    }
+    public virtual bool Exists(PackageBundle bundle)
+    {
+        return _fileSystemManager.AccessSync(bundle.FileName);
+    }
+    public virtual bool NeedDownload(PackageBundle bundle)
+    {
+        if (Belong(bundle) == false)
+            return false;
+
+        return Exists(bundle) == false;
+    }
+    public virtual bool NeedUnpack(PackageBundle bundle)
+    {
+        return false;
+    }
+    public virtual bool NeedImport(PackageBundle bundle)
+    {
+        return false;
+    }
+
+    public virtual byte[] ReadFileData(PackageBundle bundle)
+    {
+        throw new System.NotImplementedException();
+    }
+    public virtual string ReadFileText(PackageBundle bundle)
+    {
+        throw new System.NotImplementedException();
+    }
+    
+    #region 内部方法
+    private string GetFileLoadPath(PackageBundle bundle)
+    {
+        if (_cacheFilePaths.TryGetValue(bundle.BundleGUID, out string filePath) == false)
+        {
+            filePath = _fileSystemManager.GetLocalCachedPathForUrl(bundle.FileName);
+            _cacheFilePaths.Add(bundle.BundleGUID, filePath);
+        }
+        return filePath;
+    }
+    #endregion
+}
+#endif
\ No newline at end of file
diff --git a/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/ByteGameFileSystem.cs.meta b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/ByteGameFileSystem.cs.meta
new file mode 100644
index 0000000..ac1a607
--- /dev/null
+++ b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/ByteGameFileSystem.cs.meta	
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: e6b4324eddc60f045aa271bc5bb50cc9
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation.meta b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation.meta
new file mode 100644
index 0000000..7e4113c
--- /dev/null
+++ b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation.meta	
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 8cba5e0b26df8ee40a93d697f889e33d
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSDownloadFileOperation.cs b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSDownloadFileOperation.cs
new file mode 100644
index 0000000..611d685
--- /dev/null
+++ b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSDownloadFileOperation.cs	
@@ -0,0 +1,101 @@
+#if UNITY_WEBGL
+using UnityEngine;
+using UnityEngine.Networking;
+using YooAsset;
+
+internal class BGFSDownloadFileOperation : DefaultDownloadFileOperation
+{
+    private ByteGameFileSystem _fileSystem;
+    private ESteps _steps = ESteps.None;
+    
+    internal BGFSDownloadFileOperation(ByteGameFileSystem fileSystem, PackageBundle bundle, DownloadParam param) : base(bundle, param)
+    {
+        _fileSystem = fileSystem;
+    }
+    internal override void InternalOnStart()
+    {
+        _steps = ESteps.CreateRequest;
+    }
+    internal override void InternalOnUpdate()
+    {
+        // 创建下载器
+        if (_steps == ESteps.CreateRequest)
+        {
+            // 获取请求地址
+            _requestURL = GetRequestURL();
+
+            // 重置变量
+            ResetRequestFiled();
+
+            // 创建下载器
+            CreateWebRequest();
+
+            _steps = ESteps.CheckRequest;
+        }
+
+        // 检测下载结果
+        if (_steps == ESteps.CheckRequest)
+        {
+            DownloadProgress = _webRequest.downloadProgress;
+            DownloadedBytes = (long)_webRequest.downloadedBytes;
+            Progress = DownloadProgress;
+            if (_webRequest.isDone == false)
+            {
+                CheckRequestTimeout();
+                return;
+            }
+
+            // 检查网络错误
+            if (CheckRequestResult())
+            {
+                _steps = ESteps.Done;
+                Status = EOperationStatus.Succeed;
+            }
+            else
+            {
+                _steps = ESteps.TryAgain;
+            }
+
+            // 注意：最终释放请求器
+            DisposeWebRequest();
+        }
+
+        // 重新尝试下载
+        if (_steps == ESteps.TryAgain)
+        {
+            if (FailedTryAgain <= 0)
+            {
+                Status = EOperationStatus.Failed;
+                _steps = ESteps.Done;
+                YooLogger.Error(Error);
+                return;
+            }
+
+            _tryAgainTimer += Time.unscaledDeltaTime;
+            if (_tryAgainTimer > 1f)
+            {
+                FailedTryAgain--;
+                _steps = ESteps.CreateRequest;
+                YooLogger.Warning(Error);
+            }
+        }
+    }
+
+    private void CreateWebRequest()
+    {
+        //TODO : 抖音小游戏没有找到预下载方法
+        _webRequest = UnityWebRequestAssetBundle.GetAssetBundle(_requestURL);
+        _webRequest.disposeDownloadHandlerOnDispose = true;
+        _webRequest.SendWebRequest();
+    }
+    private void DisposeWebRequest()
+    {
+        if (_webRequest != null)
+        {
+            //注意：引擎底层会自动调用Abort方法
+            _webRequest.Dispose();
+            _webRequest = null;
+        }
+    }
+}
+#endif
\ No newline at end of file
diff --git a/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSDownloadFileOperation.cs.meta b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSDownloadFileOperation.cs.meta
new file mode 100644
index 0000000..b3abf50
--- /dev/null
+++ b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSDownloadFileOperation.cs.meta	
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 0bdf53359f9e17b41b08982a2be2098c
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSInitializeOperation.cs b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSInitializeOperation.cs
new file mode 100644
index 0000000..8beec7f
--- /dev/null
+++ b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSInitializeOperation.cs	
@@ -0,0 +1,20 @@
+#if UNITY_WEBGL
+using YooAsset;
+
+internal partial class BGFSInitializeOperation : FSInitializeFileSystemOperation
+{
+    private readonly ByteGameFileSystem _fileSystem;
+
+    public BGFSInitializeOperation(ByteGameFileSystem fileSystem)
+    {
+        _fileSystem = fileSystem;
+    }
+    internal override void InternalOnStart()
+    {
+        Status = EOperationStatus.Succeed;
+    }
+    internal override void InternalOnUpdate()
+    {
+    }
+}
+#endif
\ No newline at end of file
diff --git a/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSInitializeOperation.cs.meta b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSInitializeOperation.cs.meta
new file mode 100644
index 0000000..e6e0ca6
--- /dev/null
+++ b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSInitializeOperation.cs.meta	
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 614227bf558da7149a7eb6de7dfa1a21
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSLoadBundleOperation.cs b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSLoadBundleOperation.cs
new file mode 100644
index 0000000..790f677
--- /dev/null
+++ b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSLoadBundleOperation.cs	
@@ -0,0 +1,102 @@
+#if UNITY_WEBGL
+using UnityEditor.PackageManager.Requests;
+using UnityEngine;
+using UnityEngine.Networking;
+using YooAsset;
+
+internal class BGFSLoadBundleOperation : FSLoadBundleOperation
+{
+    private enum ESteps
+    {
+        None,
+        LoadBundleFile,
+        Done,
+    }
+
+    private readonly ByteGameFileSystem _fileSystem;
+    private readonly PackageBundle _bundle;
+    private UnityWebRequest _webRequest;
+    private ESteps _steps = ESteps.None;
+
+    internal BGFSLoadBundleOperation(ByteGameFileSystem fileSystem, PackageBundle bundle)
+    {
+        _fileSystem = fileSystem;
+        _bundle = bundle;
+    }
+    internal override void InternalOnStart()
+    {
+        _steps = ESteps.LoadBundleFile;
+    }
+    internal override void InternalOnUpdate()
+    {
+        if (_steps == ESteps.None || _steps == ESteps.Done)
+            return;
+
+        if (_steps == ESteps.LoadBundleFile)
+        {
+            if (_webRequest == null)
+            {
+                string mainURL = _fileSystem.RemoteServices.GetRemoteMainURL(_bundle.FileName);
+                _webRequest = UnityWebRequestAssetBundle.GetAssetBundle(mainURL);
+                _webRequest.SendWebRequest();
+            }
+
+            DownloadProgress = _webRequest.downloadProgress;
+            DownloadedBytes = (long)_webRequest.downloadedBytes;
+            Progress = DownloadProgress;
+            if (_webRequest.isDone == false)
+                return;
+
+            if (CheckRequestResult())
+            {
+                _steps = ESteps.Done;
+                Result = (_webRequest.downloadHandler as DownloadHandlerAssetBundle).assetBundle;
+                Status = EOperationStatus.Succeed;
+            }
+            else
+            {
+                _steps = ESteps.Done;
+                Status = EOperationStatus.Failed;
+            }
+        }
+    }
+    internal override void InternalWaitForAsyncComplete()
+    {
+        if (_steps != ESteps.Done)
+        {
+            _steps = ESteps.Done;
+            Status = EOperationStatus.Failed;
+            Error = "WebGL platform not support sync load method !";
+            UnityEngine.Debug.LogError(Error);
+        }
+    }
+    public override void AbortDownloadOperation()
+    {
+    }
+
+    private bool CheckRequestResult()
+    {
+#if UNITY_2020_3_OR_NEWER
+        if (_webRequest.result != UnityWebRequest.Result.Success)
+        {
+            Error = _webRequest.error;
+            return false;
+        }
+        else
+        {
+            return true;
+        }
+#else
+        if (_webRequest.isNetworkError || _webRequest.isHttpError)
+        {
+            Error = _webRequest.error;
+            return false;
+        }
+        else
+        {
+            return true;
+        }
+#endif
+    }
+}
+#endif
\ No newline at end of file
diff --git a/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSLoadBundleOperation.cs.meta b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSLoadBundleOperation.cs.meta
new file mode 100644
index 0000000..2b1312a
--- /dev/null
+++ b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSLoadBundleOperation.cs.meta	
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 19997de7b89b54445961e8b973f43ab3
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSLoadPackageManifestOperation.cs b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSLoadPackageManifestOperation.cs
new file mode 100644
index 0000000..7a0d0b1
--- /dev/null
+++ b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSLoadPackageManifestOperation.cs	
@@ -0,0 +1,88 @@
+#if UNITY_WEBGL
+using YooAsset;
+
+internal class BGFSLoadPackageManifestOperation : FSLoadPackageManifestOperation
+{
+    private enum ESteps
+    {
+        None,
+        RequestRemotePackageHash,
+        LoadRemotePackageManifest,
+        Done,
+    }
+
+    private readonly ByteGameFileSystem _fileSystem;
+    private readonly string _packageVersion;
+    private readonly int _timeout;
+    private RequestByteGamePackageHashOperation _requestRemotePackageHashOp;
+    private LoadByteGamePackageManifestOperation _loadRemotePackageManifestOp;
+    private ESteps _steps = ESteps.None;
+
+    
+    public BGFSLoadPackageManifestOperation(ByteGameFileSystem fileSystem, string packageVersion, int timeout)
+    {
+        _fileSystem = fileSystem;
+        _packageVersion = packageVersion;
+        _timeout = timeout;
+    }
+    internal override void InternalOnStart()
+    {
+        _steps = ESteps.RequestRemotePackageHash;
+    }
+    internal override void InternalOnUpdate()
+    {
+        if (_steps == ESteps.None || _steps == ESteps.Done)
+            return;
+
+        if (_steps == ESteps.RequestRemotePackageHash)
+        {
+            if (_requestRemotePackageHashOp == null)
+            {
+                _requestRemotePackageHashOp = new RequestByteGamePackageHashOperation(_fileSystem, _packageVersion, _timeout);
+                OperationSystem.StartOperation(_fileSystem.PackageName, _requestRemotePackageHashOp);
+            }
+
+            if (_requestRemotePackageHashOp.IsDone == false)
+                return;
+
+            if (_requestRemotePackageHashOp.Status == EOperationStatus.Succeed)
+            {
+                _steps = ESteps.LoadRemotePackageManifest;
+            }
+            else
+            {
+                _steps = ESteps.Done;
+                Status = EOperationStatus.Failed;
+                Error = _requestRemotePackageHashOp.Error;
+            }
+        }
+
+        if (_steps == ESteps.LoadRemotePackageManifest)
+        {
+            if (_loadRemotePackageManifestOp == null)
+            {
+                string packageHash = _requestRemotePackageHashOp.PackageHash;
+                _loadRemotePackageManifestOp = new LoadByteGamePackageManifestOperation(_fileSystem, _packageVersion, packageHash, _timeout);
+                OperationSystem.StartOperation(_fileSystem.PackageName, _loadRemotePackageManifestOp);
+            }
+
+            Progress = _loadRemotePackageManifestOp.Progress;
+            if (_loadRemotePackageManifestOp.IsDone == false)
+                return;
+
+            if (_loadRemotePackageManifestOp.Status == EOperationStatus.Succeed)
+            {
+                _steps = ESteps.Done;
+                Manifest = _loadRemotePackageManifestOp.Manifest;
+                Status = EOperationStatus.Succeed;
+            }
+            else
+            {
+                _steps = ESteps.Done;
+                Status = EOperationStatus.Failed;
+                Error = _loadRemotePackageManifestOp.Error;
+            }
+        }
+    }
+}
+#endif
\ No newline at end of file
diff --git a/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSLoadPackageManifestOperation.cs.meta b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSLoadPackageManifestOperation.cs.meta
new file mode 100644
index 0000000..7b4505f
--- /dev/null
+++ b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSLoadPackageManifestOperation.cs.meta	
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 2850c0b0e742f824f9d1f12b7d68b806
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSRequestPackageVersionOperation.cs b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSRequestPackageVersionOperation.cs
new file mode 100644
index 0000000..0b2a91f
--- /dev/null
+++ b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSRequestPackageVersionOperation.cs	
@@ -0,0 +1,60 @@
+#if UNITY_WEBGL
+using YooAsset;
+
+internal class BGFSRequestPackageVersionOperation : FSRequestPackageVersionOperation
+{
+    private enum ESteps
+    {
+        None,
+        RequestPackageVersion,
+        Done,
+    }
+
+    private readonly ByteGameFileSystem _fileSystem;
+    private readonly int _timeout;
+    private RequestByteGamePackageVersionOperation _requestWebPackageVersionOp;
+    private ESteps _steps = ESteps.None;
+
+
+    internal BGFSRequestPackageVersionOperation(ByteGameFileSystem fileSystem, int timeout)
+    {
+        _fileSystem = fileSystem;
+        _timeout = timeout;
+    }
+    internal override void InternalOnStart()
+    {
+        _steps = ESteps.RequestPackageVersion;
+    }
+    internal override void InternalOnUpdate()
+    {
+        if (_steps == ESteps.None || _steps == ESteps.Done)
+            return;
+
+        if (_steps == ESteps.RequestPackageVersion)
+        {
+            if (_requestWebPackageVersionOp == null)
+            {
+                _requestWebPackageVersionOp = new RequestByteGamePackageVersionOperation(_fileSystem, _timeout);
+                OperationSystem.StartOperation(_fileSystem.PackageName, _requestWebPackageVersionOp);
+            }
+
+            Progress = _requestWebPackageVersionOp.Progress;
+            if (_requestWebPackageVersionOp.IsDone == false)
+                return;
+
+            if (_requestWebPackageVersionOp.Status == EOperationStatus.Succeed)
+            {
+                _steps = ESteps.Done;
+                PackageVersion = _requestWebPackageVersionOp.PackageVersion;
+                Status = EOperationStatus.Succeed;
+            }
+            else
+            {
+                _steps = ESteps.Done;
+                Status = EOperationStatus.Failed;
+                Error = _requestWebPackageVersionOp.Error;
+            }
+        }
+    }
+}
+#endif
\ No newline at end of file
diff --git a/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSRequestPackageVersionOperation.cs.meta b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSRequestPackageVersionOperation.cs.meta
new file mode 100644
index 0000000..80e9802
--- /dev/null
+++ b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/BGFSRequestPackageVersionOperation.cs.meta	
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 8210185faba92a3479bf6713abab1f19
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/internal.meta b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/internal.meta
new file mode 100644
index 0000000..6df9ad2
--- /dev/null
+++ b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/internal.meta	
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 101c97835f86e9147993961f514caf2c
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/internal/LoadByteGamePackageManifestOperation.cs b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/internal/LoadByteGamePackageManifestOperation.cs
new file mode 100644
index 0000000..395a5e3
--- /dev/null
+++ b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/internal/LoadByteGamePackageManifestOperation.cs	
@@ -0,0 +1,125 @@
+#if UNITY_WEBGL
+using YooAsset;
+
+internal class LoadByteGamePackageManifestOperation : AsyncOperationBase
+{
+    private enum ESteps
+    {
+        None,
+        RequestFileData,
+        VerifyFileData,
+        LoadManifest,
+        Done,
+    }
+
+    private readonly ByteGameFileSystem _fileSystem;
+    private readonly string _packageVersion;
+    private readonly string _packageHash;
+    private readonly int _timeout;
+    private UnityWebDataRequestOperation _webDataRequestOp;
+    private DeserializeManifestOperation _deserializer;
+    private int _requestCount = 0;
+    private ESteps _steps = ESteps.None;
+
+    /// <summary>
+    /// 包裹清单
+    /// </summary>
+    public PackageManifest Manifest { private set; get; }
+
+
+    internal LoadByteGamePackageManifestOperation(ByteGameFileSystem fileSystem, string packageVersion, string packageHash, int timeout)
+    {
+        _fileSystem = fileSystem;
+        _packageVersion = packageVersion;
+        _packageHash = packageHash;
+        _timeout = timeout;
+    }
+    internal override void InternalOnStart()
+    {
+        _requestCount = WebRequestCounter.GetRequestFailedCount(_fileSystem.PackageName, nameof(LoadByteGamePackageManifestOperation));
+        _steps = ESteps.RequestFileData;
+    }
+    internal override void InternalOnUpdate()
+    {
+        if (_steps == ESteps.None || _steps == ESteps.Done)
+            return;
+
+        if (_steps == ESteps.RequestFileData)
+        {
+            if (_webDataRequestOp == null)
+            {
+                string fileName = YooAssetSettingsData.GetManifestBinaryFileName(_fileSystem.PackageName, _packageVersion);
+                string url = GetRequestURL(fileName);
+                _webDataRequestOp = new UnityWebDataRequestOperation(url, _timeout);
+                OperationSystem.StartOperation(_fileSystem.PackageName, _webDataRequestOp);
+            }
+
+            Progress = _webDataRequestOp.Progress;
+            if (_webDataRequestOp.IsDone == false)
+                return;
+
+            if (_webDataRequestOp.Status == EOperationStatus.Succeed)
+            {
+                _steps = ESteps.VerifyFileData;
+            }
+            else
+            {
+                _steps = ESteps.Done;
+                Status = EOperationStatus.Failed;
+                Error = _webDataRequestOp.Error;
+                WebRequestCounter.RecordRequestFailed(_fileSystem.PackageName, nameof(LoadByteGamePackageManifestOperation));
+            }
+        }
+
+        if (_steps == ESteps.VerifyFileData)
+        {
+            string fileHash = HashUtility.BytesMD5(_webDataRequestOp.Result);
+            if (fileHash == _packageHash)
+            {
+                _steps = ESteps.LoadManifest;
+            }
+            else
+            {
+                _steps = ESteps.Done;
+                Status = EOperationStatus.Failed;
+                Error = "Failed to verify wechat package manifest file!";
+            }
+        }
+
+        if (_steps == ESteps.LoadManifest)
+        {
+            if (_deserializer == null)
+            {
+                _deserializer = new DeserializeManifestOperation(_webDataRequestOp.Result);
+                OperationSystem.StartOperation(_fileSystem.PackageName, _deserializer);
+            }
+
+            Progress = _deserializer.Progress;
+            if (_deserializer.IsDone == false)
+                return;
+
+            if (_deserializer.Status == EOperationStatus.Succeed)
+            {
+                _steps = ESteps.Done;
+                Manifest = _deserializer.Manifest;
+                Status = EOperationStatus.Succeed;
+            }
+            else
+            {
+                _steps = ESteps.Done;
+                Status = EOperationStatus.Failed;
+                Error = _deserializer.Error;
+            }
+        }
+    }
+
+    private string GetRequestURL(string fileName)
+    {
+        // 轮流返回请求地址
+        if (_requestCount % 2 == 0)
+            return _fileSystem.RemoteServices.GetRemoteMainURL(fileName);
+        else
+            return _fileSystem.RemoteServices.GetRemoteFallbackURL(fileName);
+    }
+}
+#endif
\ No newline at end of file
diff --git a/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/internal/LoadByteGamePackageManifestOperation.cs.meta b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/internal/LoadByteGamePackageManifestOperation.cs.meta
new file mode 100644
index 0000000..6bb1e19
--- /dev/null
+++ b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/internal/LoadByteGamePackageManifestOperation.cs.meta	
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: b648d648fa0c4e44d811b42b80891543
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/internal/RequestByteGamePackageHashOperation.cs b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/internal/RequestByteGamePackageHashOperation.cs
new file mode 100644
index 0000000..7cfb018
--- /dev/null
+++ b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/internal/RequestByteGamePackageHashOperation.cs	
@@ -0,0 +1,90 @@
+#if UNITY_WEBGL
+using YooAsset;
+
+internal class RequestByteGamePackageHashOperation : AsyncOperationBase
+{
+    private enum ESteps
+    {
+        None,
+        RequestPackageHash,
+        Done,
+    }
+
+    private readonly ByteGameFileSystem _fileSystem;
+    private readonly string _packageVersion;
+    private readonly int _timeout;
+    private UnityWebTextRequestOperation _webTextRequestOp;
+    private int _requestCount = 0;
+    private ESteps _steps = ESteps.None;
+
+    /// <summary>
+    /// 包裹哈希值
+    /// </summary>
+    public string PackageHash { private set; get; }
+
+
+    public RequestByteGamePackageHashOperation(ByteGameFileSystem fileSystem, string packageVersion, int timeout)
+    {
+        _fileSystem = fileSystem;
+        _packageVersion = packageVersion;
+        _timeout = timeout;
+    }
+    internal override void InternalOnStart()
+    {
+        _requestCount = WebRequestCounter.GetRequestFailedCount(_fileSystem.PackageName, nameof(RequestByteGamePackageHashOperation));
+        _steps = ESteps.RequestPackageHash;
+    }
+    internal override void InternalOnUpdate()
+    {
+        if (_steps == ESteps.None || _steps == ESteps.Done)
+            return;
+
+        if (_steps == ESteps.RequestPackageHash)
+        {
+            if (_webTextRequestOp == null)
+            {
+                string fileName = YooAssetSettingsData.GetPackageHashFileName(_fileSystem.PackageName, _packageVersion);
+                string url = GetRequestURL(fileName);
+                _webTextRequestOp = new UnityWebTextRequestOperation(url, _timeout);
+                OperationSystem.StartOperation(_fileSystem.PackageName, _webTextRequestOp);
+            }
+
+            Progress = _webTextRequestOp.Progress;
+            if (_webTextRequestOp.IsDone == false)
+                return;
+
+            if (_webTextRequestOp.Status == EOperationStatus.Succeed)
+            {
+                PackageHash = _webTextRequestOp.Result;
+                if (string.IsNullOrEmpty(PackageHash))
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Failed;
+                    Error = $"Wechat package hash file content is empty !";
+                }
+                else
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Succeed;
+                }
+            }
+            else
+            {
+                _steps = ESteps.Done;
+                Status = EOperationStatus.Failed;
+                Error = _webTextRequestOp.Error;
+                WebRequestCounter.RecordRequestFailed(_fileSystem.PackageName, nameof(RequestByteGamePackageHashOperation));
+            }
+        }
+    }
+
+    private string GetRequestURL(string fileName)
+    {
+        // 轮流返回请求地址
+        if (_requestCount % 2 == 0)
+            return _fileSystem.RemoteServices.GetRemoteMainURL(fileName);
+        else
+            return _fileSystem.RemoteServices.GetRemoteFallbackURL(fileName);
+    }
+}
+#endif
\ No newline at end of file
diff --git a/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/internal/RequestByteGamePackageHashOperation.cs.meta b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/internal/RequestByteGamePackageHashOperation.cs.meta
new file mode 100644
index 0000000..7a99745
--- /dev/null
+++ b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/internal/RequestByteGamePackageHashOperation.cs.meta	
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 51a0e40e248b49a4783b3dca33a23cf1
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/internal/RequestByteGamePackageVersionOperation.cs b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/internal/RequestByteGamePackageVersionOperation.cs
new file mode 100644
index 0000000..963deaf
--- /dev/null
+++ b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/internal/RequestByteGamePackageVersionOperation.cs	
@@ -0,0 +1,88 @@
+#if UNITY_WEBGL
+using YooAsset;
+
+internal class RequestByteGamePackageVersionOperation : AsyncOperationBase
+{
+    private enum ESteps
+    {
+        None,
+        RequestPackageVersion,
+        Done,
+    }
+
+    private readonly ByteGameFileSystem _fileSystem;
+    private readonly int _timeout;
+    private UnityWebTextRequestOperation _webTextRequestOp;
+    private int _requestCount = 0;
+    private ESteps _steps = ESteps.None;
+
+    /// <summary>
+    /// 包裹版本
+    /// </summary>
+    public string PackageVersion { private set; get; }
+
+    
+    public RequestByteGamePackageVersionOperation(ByteGameFileSystem fileSystem, int timeout)
+    {
+        _fileSystem = fileSystem;
+        _timeout = timeout;
+    }
+    internal override void InternalOnStart()
+    {
+        _requestCount = WebRequestCounter.GetRequestFailedCount(_fileSystem.PackageName, nameof(RequestByteGamePackageVersionOperation));
+        _steps = ESteps.RequestPackageVersion;
+    }
+    internal override void InternalOnUpdate()
+    {
+        if (_steps == ESteps.None || _steps == ESteps.Done)
+            return;
+
+        if (_steps == ESteps.RequestPackageVersion)
+        {
+            if (_webTextRequestOp == null)
+            {
+                string fileName = YooAssetSettingsData.GetPackageVersionFileName(_fileSystem.PackageName);
+                string url = GetRequestURL(fileName);
+                _webTextRequestOp = new UnityWebTextRequestOperation(url, _timeout);
+                OperationSystem.StartOperation(_fileSystem.PackageName, _webTextRequestOp);
+            }
+
+            Progress = _webTextRequestOp.Progress;
+            if (_webTextRequestOp.IsDone == false)
+                return;
+
+            if (_webTextRequestOp.Status == EOperationStatus.Succeed)
+            {
+                PackageVersion = _webTextRequestOp.Result;
+                if (string.IsNullOrEmpty(PackageVersion))
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Failed;
+                    Error = $"Wechat package version file content is empty !";
+                }
+                else
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Succeed;
+                }
+            }
+            else
+            {
+                _steps = ESteps.Done;
+                Status = EOperationStatus.Failed;
+                Error = _webTextRequestOp.Error;
+                WebRequestCounter.RecordRequestFailed(_fileSystem.PackageName, nameof(RequestByteGamePackageVersionOperation));
+            }
+        }
+    }
+
+    private string GetRequestURL(string fileName)
+    {
+        // 轮流返回请求地址
+        if (_requestCount % 2 == 0)
+            return _fileSystem.RemoteServices.GetRemoteMainURL(fileName);
+        else
+            return _fileSystem.RemoteServices.GetRemoteFallbackURL(fileName);
+    }
+}
+#endif
\ No newline at end of file
diff --git a/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/internal/RequestByteGamePackageVersionOperation.cs.meta b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/internal/RequestByteGamePackageVersionOperation.cs.meta
new file mode 100644
index 0000000..be04d19
--- /dev/null
+++ b/Assets/YooAsset/Samples~/Extension Sample/Runtime/ByteGameFileSystem/Operation/internal/RequestByteGamePackageVersionOperation.cs.meta	
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: a04c463fb00f60f499541fbb98e4fdc4
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/YooAsset/Samples~/Extension Sample/Runtime/YooAsset.RuntimeExtension.asmdef b/Assets/YooAsset/Samples~/Extension Sample/Runtime/YooAsset.RuntimeExtension.asmdef
index 1440681..3095837 100644
--- a/Assets/YooAsset/Samples~/Extension Sample/Runtime/YooAsset.RuntimeExtension.asmdef	
+++ b/Assets/YooAsset/Samples~/Extension Sample/Runtime/YooAsset.RuntimeExtension.asmdef	
@@ -3,7 +3,8 @@
     "rootNamespace": "",
     "references": [
         "GUID:e34a5702dd353724aa315fb8011f08c3",
-        "GUID:5efd170ecd8084500bed5692932fe14e"
+        "GUID:5efd170ecd8084500bed5692932fe14e",
+        "GUID:0f8df04a5a494444eb8fa0504f6fb965"
     ],
     "includePlatforms": [],
     "excludePlatforms": [],