Anke
23
Yes, to ask for permissions (and grant / deny them), they must be declared in the Manifest.
There is no permission for that. You need to use the KeepScreenOn method of the TaifunTools extension App Inventor Extensions: Tools | Pura Vida Apps

And as @ChrisWard said, WRITE_EXTERNAL_STORAGE is sufficient as it implicitly grants READ permission. https://developer.android.com/reference/android/Manifest.permission
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