This morning I figured out how to enable and fully support embedded video files that are hosted on other sites.
For example, if you have an mp4/mv4/ogg file hosted on imgur, you can now link to that file and embed it here.
The idea came to me when I saw this post.
The video file that you see at the top of the screen was in fact a broken image icon. I investigated why, then researched how to make it work. Now it does.
If you also want to have a site like imgur (or your own) host a video file, you can now pop it in-between the [vids] tag you'll see now when you make a new most or reply. I also updated the stylesheet so your video will fill the width of the site template, either in desktop or mobile web.