That’s the USB/ SSD’s formatted type, but that’s not the extensions of the files themselves.
I have a microSD card in a tiny thumb-sized USB C reader plugged into my Leon, loaded with MP3s that play perfectly. Plug it in, go to the media/ radio (purple icon), and it’s one of the menus on the left hand side from memory. You can play all music, or folders only (ie albums for you). It’s possible, for sure.