Arcade emulation is tricky. Instead of random files, search for a FBNeo is the most Android-friendly arcade core in RetroArch, and having a matching ROM set ensures that every title launches without a "missing files" error. How to Set Up Your ROM Pack in RetroArch
Files are often pre-named to match RetroArch’s database, ensuring that box art and metadata download correctly. pack roms para retroarch android better
The best packs remove "clones" (duplicate versions of the same game from different regions) and non-working files. Arcade emulation is tricky