Error 2103: file could not be created

Here you don’t even know where to start listing all mistakes.
You should first learn a few basics before you ask any questions here.

  1. TaifunTools.PathToAssets only works in connection with a WebView.
    (But it is no longer needed, because you can also use this: http://localhost/test.html)
  2. Assets are read-only.
  3. Storage permissions are only required to be able to access the external storage. Saving / writing to an arbitrary folder of the external storage is no longer possible on Android 11+.

See also here:

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