I also had this issue while trying to embed an instructional video from TikTok into Canvas. I ended up having to save the video as an mp4 file on my iPhone, then send the mp4 from my phone to my laptop, then upload it to canvas. Of course, Canvas still thinks that all videos should be landscape, so it changed the orientation of the video, thus decreasing its playback quality. Thankfully, I also put the link to the original TT video along with the mp4 so students could link out to the source.
The reality is that TikTok IS a viable source for instructional content just like YouTube, and I hope that Canvas eventually supports the embed code format and the vertical video orientation.
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