If you'd like to become a site sponsor, just make a donation of $20 or more using the Paypal button. Then register for site membership if you haven't already. I will personally designate you as a sponsor in the site's database. Yeah, I'm really Jody Hall, site owner, but I can be Joe Schmoe too. Apologies to any real life Joe Shmoe's out there.
This is an example forum post by Joe Shmoe, site sponsor. Sponsors are able to upload an example swf file, and place it directly in their post. This can be for the sake of demonstrating how a problem file is behaving, or conversely, just to show off a good one! The file size limit for the SWF file is about 100 K. Sponsors can also access the files they've uploaded to the server with their own file browser window.
Those who register with the website (but are not sponsors) can still upload their source files using the "Source File" field that appears just below the text editor. Because of the way this Drupal system works, files can only be attached to the initial forum post (new thread) and not to any replies.