Know-How Exchange : E-Marketing

You don't acutally upload the file to itunes. You need to store the file somewhere else and create an XML feed. This is a file that explains what the file is, how large it is, where it is located etc. You can then submit the address to this XML file to itunes.

Here are some directions: https://www.mvldesign.com/itunespodcast.html
and a second one https://www.feedforall.com/itune-tutorial-tags.htm.

Hope this helps,
Mike