Hello Taifun, thank you.
I uploaded the high quality screenshot of my app blocks on WeTransfer:
I confirm the app has been made successfully working beforehand in foregrond, then I converted it to background service by Itoo extension, as per Kumaraswamy's guidelines.
As component for file access I used MFile extension (MFile - a modified version of Sunny's `EFile` extension - Shared folders - storage permissions - Android 11+) and I confirm it works fine with the background service. The problem is related only to service stopping by buttons.
Regards.