The extension filter option while importing doesn't appear to work. Specifically when I set it to just import .sfc files and point it to my SNES MSU-1 folder, it still grabs all the .PCM files and imports them as blank games. It does properly show just the .sfc files in the "Import Games" screen, with "The import process has found the following <x> files to import:" looking correct, but then it seems to go on and just import everything anyway.
I'm on an Ayaneo Pocket Air running Android 12, in case that's relevant. Looking at the changelog I'm guessing something happened in version 1.11, but I do not see any way to access earlier versions to try 1.10.