iOS white screen on build

Hello, I am using the latest version of unity-webview.
It works good on Android and iOS Simulator, but doesn't work on iOS build ( doesn't load html).

Local path generator

    public string generatePath(string path)
    {
#if (UNITY_EDITOR_OSX || UNITY_STANDALONE_OSX || UNITY_IOS) && !UNITY_EDITOR_WIN
        return Path.Combine("file://" + Application.streamingAssetsPath, path);
#elif UNITY_ANDROID
        return Path.Combine("file:///android_asset/", path);
#else
        return Path.Combine("file://" + Application.streamingAssetsPath, path);
#endif
    }

And using

webViewObject.LoadURL(generatePath("local_www/History/History_XIX.html"));

What can cause this behavior?

Start by reproducing the white screen on an iOS build rather than the simulator, then inspect the generatePath method and the webViewObject.LoadURL call. Compare the local HTML path behavior across the UNITY_IOS and UNITY_ANDROID branches; done means identifying why local_www/History/History_XIX.html fails to load on the iOS build and documenting or fixing that behavior.