Have added a feature ticket to review for any missing file extension icon mappings.

forge.joomlapolis.com/issues/6487

I'll be adding support for any file extension that fontawesome provides. There's no way to add your own unless you modify the template files and change the icon output.

One other point, during testing, when you upload a file and click save, the upload screen stays there with no indication it has saved. The saved button remains. Under that is a DONE button and when you click on that you get the message that any unsaved work will be lost so students are confused if it has saved. They are used to it now but it is not clear. I wonder if you can simplify this, maybe the save button vanishes once it is saved, I am not sure or a message comes up saying, Saved, Click DONE to exit. etc.

The save button is used to save changes to title, description, and folder. The done button indicates you're done uploading and making changes. It makes sure you're done as if you changed a description and didn't click save then your changes won't be saved.

This behavior is planned to change. In short it'll be keeping track of inputs that have changed. Clicking done would then save everything if it hasn't been saved yet and the confirm dialog will go away so there can't be any mistakes or confusion in that regard.