Image Name as Alt Text button not working

Hi! I'm trying to use the Image Name as Alt Text button on some images, but nothing happens when I click the button. The plugin and wordpress are both the current version. I've tried doing multiple files and just one file, two different browsers, etc. I tried indexing the images first. Just nothing at all happens when I click the button.

Do you know what I need to do to make it work?

Thanks!