I have the same issue. My USB came with my Pinsound+
Loaded it up. It had 5 files on it, original and 4 Mr T files..
It can only see The techo and Original mix (but the original mix call outs are cut off (when I play them stand alone).
If I put Baby Driver stand alone on the USB, it doesnt find it and I get the "there are no sound files on the USB drive"
Unzipped files - into the audio directory
Transferring from Mac onto the supplied Sandisk, FAT32 format, havent changed that.
Wondering if I am missing something obv..
Diagnostic shows Techno and original, but doesnt show baby driver, even though its on the stick.