Loading level through assest bundle problem

I am trying to load a level through assest bundle in webgl.
I am running in to some problem. Terrain texture is not loaded. some materials appear pink. Post processing is not loaded. Anyway to fix this problem. Heres my code

Code (CSharp):

1.  IEnumerator Start()
2.     {
3.         string filePath = System.IO.Path.Combine(Application.streamingAssetsPath, "scenetest");
4.         //  filePath = System.IO.Path.Combine(filePath, "scenetest");
5.         Debug.Log(filePath);
6.        
7.        
8.         using (UnityWebRequest uwr = UnityWebRequestAssetBundle.GetAssetBundle(filePath))
9.         {
10.             yield return uwr.SendWebRequest();
11.  
12.             if (uwr.isNetworkError || uwr.isHttpError)
13.             {
14.                 Debug.Log(uwr.error);
15.             }
16.             else
17.             {
18.                 // Get downloaded asset bundle
19.                 AssetBundle bundle = DownloadHandlerAssetBundle.GetContent(uwr);
20.             }
21.         }