If there's one piece of feedback I've been holding onto for a few months now (I play on and off), it'd have to be the photo submission menu. Especially with this new stacking system, I think it's become even harder to navigate the menu to get the "Ready to Submit and Delete?" prompt.
I do like the idea of a photo stacking system, but I wish the submission menu would keep easier track of selections, have an icon guide on the page, and a manual completion button so that players know for sure they are submitting what they want and do not have to reselect photos to get the prompt.