I would like to suggest to be added loading/progress bar in some steps.
Some steps that I notice are very confusing to clients is when they click on the image to add to the upload zone, sometimes it takes a few seconds and they don't give enough time to it. there should be some way to block the screen with progress bar, or loading icon.
Could you do a screencast and post it here what you mean exactly!
It only happens on mobile.
On desktop it show a loading icon
it is difficult to undestand on the video because you can't see when I click the picture but it takes a while to place the image on the upload area. The client usually clicks several times and the site crashes
Added in V4.6.8