Bug report part: I've recently tried to upload my Fear of eights game to forge which's game folder is only 5,5 MB and resulting swf is about 5MB and it failed probably due to filesize limit on server. Could you increase it or something?
Suggestion part: It looks like when sharing game on SF SWF file is uploaded along the game (probably for Play Now feature). It shouldn't be if game + swf file is bigger than limit. Alternatively (IMHO better solution) you may split zip into volumes before uploading and when downloading if there are more than 1 volumes join them together.