Media File Renamer

Description: Media File Renamer allows you to rename files based on what you want them to be, not what WordPress defaults to. (Helpful when you have newer versions of a graphic or PDF that you want to keep at the same location and WordPress would auto-rename them to something else.)

Plugin creator’s site:

How to use: Media File Renamer is available by request from the service team. Since Media File Renamer is only available in editing view, there is no interactive demonstration available in reading view on Plugindemo. However, the plugin creator’s Tutorial page contains videos and instructions.