by Davo Smith.
Frankie - you've found the right place with the first screenshot. Now could you click on 'dndupload.php' and then click on 'response' and copy + paste what is found there.
It is clear from the last javascript error message that there is some extra junk appearing in the response from the server, which is preventing the response from being understood (not that I needed the javascript error for that, as I'd guessed that was the problem from the start).