The only thing I know is that the save data is in " /data/data/com.example.rec"
Is it /data/data/com.example.rec?
Not /emulated/0/Android/data/com.example.rec - this one is indeed empty
The problem is that shizuku doesn't grant all superuser privileges, hence in my case ZArchiver could get inside /data/data, but then I see "access denied"
So access it via PC with adb is the only viable option