Emulator Problem: Question about Retrix on Xbox One

Anyone have instructions to get ROMs to be detected? I've seen people say the ROMs can be played/downloaded from OneDrive, and I can't get that to work. On a separate N64 emulator, I was able to load Paper Mario off of OneDrive, but going back to Retrix, ROMs don't function that way (PSX and Genesis specifically)

If a flash drive is needed, what do I need to do specifically? I've only ever emulated on my phone or PC, so this is new to me (plus Retrix is still in development and functions different than any emulator I've seen)

Thanks bunches in advance!