Test "copy file from assets to shared directory and read it from there" in ai-test

[Anke]

@Taifun

READ_EXTERNAL_STORAGE is missing in the manifest

READ / WRITE permissions are only declared in the Manifest (for devices with Android 4.4 up / API 19+) if DefaultFileScope is set to Legacy. I already mentioned this several times. See e.g.: → here or here.