Last thread I've seen about grouping images (via search) is from 3-4 years ago... I would still love this option so I can move a group of images without having to reselect them every time, especially if some of them are laying on top of each other.

It's on our todo list for sure but not on top of it yet. We appreciate your feedback and we know this is a highly requested feature, hang in there!

I agree wholeheartedly; grouping would make many operations so much handier. I have individual pictures that need to stay together even if I optimize the layout (which is a fantastic tool) and have to manually mess up the optimized layout every time to get these images back next to each other, so they don't get lost or forgotten.