Help with troubleshooting: Unable to upload new asset

When trying to upload a new asset (.png or .jpg), I find that clicking “upload” does not do anything. I’ve tried using a chrome browser, explorer, and also firefox. Not sure how to proceed with uploading assets. Is there a way that asset uploading may have been disabled in settings?

There’s no setting to disable it.

The first thing I’d think of would be to check the permissions of the “files” folder and the asset subfolder. Also, check that you can upload Media without problems.