How to debug the game directly on the device?

Question

Android

Good day
There is a mobile application - a network game for android and it has constant crashes due to bugs in network communication.
How can debugging be organized so that the logs are saved somewhere and can be retrieved later?
How can an android application access the file system and write logs there?
Is there any network monitor for android?
The ADB option is not suitable.
The debug process must be managed directly on the device itself.
Any other options, welcome!)