Anytime I want to choose an image (regardless of file format or size) to create a custom theme for my forum I end up getting this "Import Ended" message in yellow print with nothing happening. I'm not sure what is causing this but I would appreciate any help in fixing this so I can update my forum.

Import is use for applying the theme you've export.

Example, i've export the whole style of my theme (the banners, buttons, and my current theme i'm using), this will download a file that you can use to import to another forum/you can make it as a backup.