Okay so I have also stumbled into an issue when pressing the submit button does nothing, no error messages, and no spinner.
I have debugged the javascript, and in this case the problem was, that the Attachment file selector accepts a bunch of file types, while internally the JS routine only allows these: " .png, .jpg, .zip, .rar, .7z, .mp4". So I could choose a txt file, but then the script silently failed.
So, two technical things:
- The allowed file types of the selector should match the ones the JS is checking for
- And web dev guys should fix the error displaying for the Attachment field