I think one thing that was unclear to me was that the first thing you do in the app is select an area, and then you get the price for a new image, but no option to use an existing one (which is what I expected). Instead you have to go to a completely separate menu option to find the existing images.

It’d be nicer if the list of the existing images for an area just showed up in the same options dialog that allows me to choose the options for new images (probably as another choice next to medium or high resolution).