I cannot update from APK version 186 to the newer ones, and I can't transfer my save files from this version to the new ones
Unfortunately, the software I used to make the apk up to that version stopped working on my machine, and I started using Android Studio. This means the app has a different ID than the previous version, but will be consistent from 188 onward.
As for the save files, the app version doesn't fully support those, so I assume you mean save files from the PC version?