I don't think it's capable with newest flarum 1.1.1 as it states in Extiverse.
- If you try to post mp4 link, it gives you,
Oops! Something went wrong. Please reload the page and try again. It posts a video, but with that error, but forum thinks it did not so Create Topic window doesn't disappear.
- Video doesn't show up in Synopsis(Front page)
I don't really care for this extension, Just gave it a try and I don't think Author will be fixing it any time. Just for others to know.