I see in the guidelines that we can submit an update with bug fixes after the submissions have closed. 

I have uploaded a new version onto itch.io, but my source is on dropbox. The  file name contains  the date and version number, so the link on the submission page for my game now points to the wrong file.  Is there a way to change the source URL that I provided when I made my submission to the jam?   I can't see where I might do that.  Am I being dim and missing something obvious?