How can we keep the images from overlapping like this screenshot, and also staying within the upload area and not bleed out? It looks terrible. I thought it was just on my site/setup but I was able to recreate the problem on the demo. See screenshots.
and the demos on the website work well, i think maybe you didn't complete the setting up the demo data.Check the video in the second link it will help you solve problem 1
I'll try the overlay mask - but I should note the second image with the three frames was screen clipped from your demo link. That wasn't taken from my site. I wanted to make sure the problem wasn't just on my own site. But I was able to duplicate it on your demo site link. (http://fancyproductdesigner.com/product/photo-frame/)