Assetbundles not loading on ios device. Any help would be appreciated.

My app loads the assetbundles perfectly on the editor, webGL and android, but it's not loading on iOS. Any idea on how can I make this work? Thanks

 IEnumerator AssetLoad(string bundURL, string bundleName)
     {
         using (var wwwB = WWW.LoadFromCacheOrDownload(bundURL, 1))
         {
             yield return wwwB;
             UnityWebRequest request = UnityWebRequest.GetAssetBundle(bundURL);
             if (!string.IsNullOrEmpty(wwwB.error))
             {
                 Debug.Log(wwwB.error);
                 yield return null;
             }
             isDownload = true;
             StartCoroutine(progress(request));
             isDownload = false;
             Debug.Log("Bundle downloaded");
             var myLoadedAssetBundle = wwwB.assetBundle;
             var asset = myLoadedAssetBundle.mainAsset;
             SceneManager.LoadScene(bundleName);
         }