I manage all the photo by PLEX.
And house is messed up by lot of stacked of picture frames from 10 years of living and family grow.
So started to search digital photo frame but still no success.
Most of them are SD card or USB photo reading only.
Some supports wifi and working with their specific App which is not my preference.
Do we have possibility to have digital frame with PLEX connection soon?
I had the same problem. I tried a cheap android phone, but on android plex doesnt play photos.
So I enden up with a raspberry with rasplex (openpht) http://www.rasplex.com connected to a cheap hdmi display.
I have seen picture frames with DLNA Support before. Never used them (nor have I used DLNA in Plex) Seems like that should work. The only problem I can think of is I believe Plex disables DLNA if you are in a Plex home.