I want to build a Flutter App that can show information in a modalBottomSheet, but outside of the App.
The App should run in the background and when I want it to show something, it should show a modalBottomSheet over the curently used App. It doesn't matter if the user is in a App or just the Homescreen, important is that the App runs from the background and can overlay other Apps.
You could use flutter_overlay_window. It can display your flutter app over other apps on the screen