CentOS - Jun 2013 - Issue tracker question: Can I delete/replace an attachment?

Hi.

I recently uploaded a file to a certain issue in the CentOS issue 
tracker. I then found it wasn't quite correct, so I edited it, then 
tried "Upload file" again, with the same filename, but got a message
saying:

APPLICATION ERROR #9

This is a duplicate file. Please delete the file first.

Please use the "Back" button in your web browser to return to the 
previous page. There you can correct whatever problems were identified 
in this error or select another action. You can also click an option 
from the menu bar to go directly to a new section.


I can't find a way to "delete the file first", though. Is this
possible?
Is there any other way I can attach a file as a replacement for 
previously attached file?

- Toralf

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