Yes all-right but I didn't add a skin myself

It is definitely Android 11 system version V12.1.1_20220707.145346_JUNC2 stated in the system information

There are no SD card slots, only a USB port.

The APK was working fine with the internal memory until I messed it up.

In file manager the path where all files are located is:
/storage/emulated/0

Chris