Hi @detour-jenn
One thing I notice in your video is that you still have access to the old rich content editor. I'm not sure how that is possible as the old rich content editor was replaced with a new editor just a few days ago. You shouldn't be seeing it. I suspect this is the issue.
I would contact whomever manages Canvas for your institution. It may be that your organization is self-hosting Canvas on their own servers and they haven't pushed out the update, which could cause this issue. That is the only explanation my experience can come up with.
Perhaps @Naomi might have more info on this.
You can read about the update to the Rich Content Editor here: https://community.canvaslms.com/t5/Deploys/Canvas-Deploy-Notes-2021-01-20/ta-p/431651
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