Hi timo, why don't just use a google drive link like https://drive.google.com/file/d/1p647P0bOjpoqZtDZQEwu-9bIZmyleibn/view?usp=sharing it's easier specially at early stages, you can check it if you wish it's an app for language students , still in alfa.

Yes maybe you are right. But i wanted to be as close as possible to the real release because i plan to release my app soon. Btw. on my device "Pixel 3a" your app runs without any problems. Interessting that you can change the theme by clicking the top appbar.