So I have be successful in adding roms for other emulators but can't seem to get mame roms to show up. I have tried multiple times with different roms with no success. Do you have to do mame roms different then say gba or psx roms because I was able to get those to work.
Check they are in a supported format, mine are just zipped, is the DIR named correctly?
Jay you can add the zip file directly to the roms folder?
Retropie came out with an image for raspberry pie 4 I'm gonna jump ship and see if it works better with it.