Thread:NewGenTV/@comment-25999606-20160129212230/@comment-5916303-20160129214108

It keeps the old files in its history. That way, if you had uploaded something you're not satisfied with, it can be reverted back. The name of the file you're re-uploading is also irrelevant, because it'll always keep the name of the original image, but the user who uploaded the original one is displayed as the uploader.