Comment 3 for bug 1378176

At the very least the adding of the image should have appendix added to it like what happens when we upload a file on the Content -> Files page

eg if I upload a file called badger.jpg more than once I get

badger.jpg
badger.jpg.1
badger.jpg.2
badger.jpg.3

So they are named visually different.

Currently there is the warning about deleting a file that is used in a skin "This file is used as a background image in one or more of your skins. Are you sure you want to delete this file?" so people shouldn't be able to delete an image from a skin by accident