Well I used the Browse USB menu to copy a couple of small videos successfully and found the videos were copied to /media/sd3/videos/F0000.
Unfortunately, attempting to copy an entire folder failed, so I can't tell if there's any to have a file folder structure available...appears not.
For each video copied, 3 files resulted, the mp4 with no extension , a txt file, a jpg file in the F0000 folder
Copying files and or folders into F0000 directly from the USB drive and running a disk scan - using ssh does not work.
Hopefully the video handling will be built out more, and being able to display photos would be nice too.
It's great to see Martin expanding the products constantly...
-Mark