Small Digital Photo Frame

Why wont my digital Photo Frame show edited pictures?
I edited some photos using photoshop elements, I MADE SURE I converted them from the standard photoshop file to a JPG and now when I load them onto the frame interface, i can see the small icons on the preview screen, but when I come to select them to view full screen an icon showing a piece of paper with a red x comes up!? it says on the box it only takes jpg, they are jpg!
I needed this for a college assignment, please help, is it something to do with the size of the files?
Thanks
I’ve always wanted to get one of those, now I’m second guessing that based on this. But if you really really want a way to beat it….it may take a lot of work, but you could try printing out the photos, then scanning them back in to your computer as JPEGs. Then your frame can’t read them as being any different from other jpegs. Hopefully your scanner scans them as jpegs. Sorry I can’t be more help!! Hope it turns out!
Spectra Digital Photo Frame Keychain (ItemSea)