I'm working on a build and spent an hour+ to specify the parts, put in links and type descriptions. The list stayed there a while, but the other day it just vanished?
The unused files should be listed towards the bottom of your screen. They will still have buttons for full size/thumbnail. If you edit your build and remove the photo from the text, you can reinsert again in desired size. Feel free to use the "start a conversation" envelope in the upper right corner of the site to message directly. Thanks!