I have a USB stick full of drum samples into a folder on the USB stick. When I try to import the audio using IMPORT AUDIO, the FG6 doesn't find them. What's up with that?
Besides what Artemiy suggests, also check the attributes of the files you're trying to import. They Fantom-G recognizes only 16-bit, 44.1kHz, stereo or mono, WAV or AIFF files.