[ubuntu-uk] Photo keyring compatible with standards?

[Adam Funk]

I made the mistake of buying a Yuraku 1.5" digital photo-frame
keyring, then discovered it not only fails to work as  a USB
mass-storage device (the obvious standard) but it isn't even
compatible with PTP (gphoto).

Can anyone recommend something like this that is compatible with
either of these standards?  (I prefer USB mass storage, but can live
with gphoto.)

Thanks.