Hi, I made a cover for my spiderman trilogy (movies) a couple months ago. The pic attached is really shrunk down for size limitations on here, so if you zoom in it gets blurry. But you can make out what's needed. Every picture in the boxes on that cover are not the ones that were there originally. The one on the cover and every pic on the back. I found the ones you see now, added them all to the original... template (white and blue cover with different pics) as different layers obviously, and somehow moved them down UNDER the layer but still visible. So I was moving them around in the "windows" until they were centered well. Like... take the big one on the front. Imagine it's a physical picture frame. The frame blocks part of the SQUARE picture of spiderman as you move it around underneath.
I hope that makes sense, cause I'm trying to do the same thing now in another picture (6 family pics trying to put them in a bigger picture with 6 "windows") and I can't figure out what in the heck I did then... I copy one pic into the main one as a new layer, and I figure I move the layer (layer 2, the 1st of 6 small pics) down... but that just moves it down the list and makes it invisible. I've tried every option in the toolbar, nothing works. I have no clue what I did before... I would just move each of the 6 smaller pics over the 6 spaces/boxes and flatten the layers but the "windows"/boxes in the main pic aren't square, they're more like quadrilaterals and I wanna get the 6 under them like the spiderman ones.