NOTE: The above is only the "Title" which can be assigned to an image, allowing you to change the name visible to the public (i.e. give it a "Title) without actually changing the original image filename in the /var/ folders or the database.
BELOW is the actual FILENAME of the image uploaded, which the database references. But if you later MANUALLY change the image filename in the database, you must also manually edit the image's filename in the /var/ folders to match. You won't be able to change it from here at that point because you've already changed the database reference necessary to get to this screen.