For me at least 1 USB drive doesn’t work (and that’s a shame ’cause it’s really tiny and would be ideal), but I think most’ll work file. Just don’t spend too much on one thinking because it is pricy it must be higher quality and thus more likely to work with the GAIA because I don’t think it works like that
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See also this topic for some previous discussion:
viewtopic.php?f=4&t=88