hello tomasz86
I consider your suggestions and decided to create a text file on Android and find out it is perfectly synced with Windows and when i modify it, modification of the file got synced too.
I tried another Keepass app but it didn’t work either. Also i checked if file modified time changed after i modify the file from Keepass app and it changed. So it is maybe not about mtime. I still don’t know what’s the reason behind this problem 
Thank you for your interest.