Is there any way to post mp3 files. Most would be 5 - 10 MB I'd guess. mp3 is an invalid file extension on the Music sub-forum, And there is currently a 256 kb limit for attachment files that use valid extensions, so mp3 of mixes would certainly exceed that threshold.
Also there was a file sharing utility on the old forum, with a 250 mb file limit. And a 30 day delete/grandfathering limit. That was useful to some members.