You can upload it as a video but it will likely take up a lot of your attachment space or it may not work depending on file format. Try it?
Get a YouTube, if you want the videos just for THP, make them non-public which means they are not private (so you can share) but they are not listed on YT.
OT: Why does it say "This post will need approval from a moderator before this post is shown." in the top of my reply box in this thread? I've never seen that before. I really had nothing to offer in a reply but this inspired me.