@Rich
to properly explore the files on a usb stick....goto the discovery page and download an application on the store I think its called filepawn.... I will edit this in a sec if that's not correct.
Anyways its much easier to install and move files around with an application that's built to do it.
edit: once installed keep hitting parent folder till you hit the root (no more parent folders) ....then you will see a folder named usbdrive
click that and your now properly surfing your usb stick.
Yes I see lots of mixed reviews about ouya but I myself see some potential in the device and enough that im dedicating my next year all towards an ouya exclusive project "AMC" (Avoiding Mass Conflict) and so far the graphic work I have done looks stunning in hd in its native resolution.
I suggest that if you are writing a game on ouya that it be in 3d or at least try to stay away from using not many sprites as this seems to be the kicker on agk v1.
v1 does seams to do ok with 3d on the ouya.(better then my blackberry stuff)