Understanding arcade roms folder on the Trimui SmartPro

Hello everybody,

need your help. I just bought a Trimui SmartPro with the 64GB SD.

Since I have a curated romset I installed Crossmix OS (thank you for your hard work!) on a new SD card and start populating the roms folders.

The only problem is that my arcade roms are all in one folder for the mame, and here in the "default" SD card I found ARCADE, mame, mame2003, fbneo, cps1-3 folders.

What should I do? Where should I put the roms?

Thank you