I would like to add a thumbnail image to videos I upload to the Commons (like you can with static files) but I don't see any way to do this. Is it even possible?
According to How do I share a document, image, video, or audio file to Commons? , the thumbnail is created automatically for video and image files, and there's no option to change it. Sorry!
This is ridiculous. Posterframe chosen at random (or by some un-revealed algorithm) is a downgrade from hosting the video on Youtube or similar. The posterframe / thumbnail image should be what I as the instructor consider immediately relevant at a glance to represent the video.
I want to be able to choose the posterframe / thumbnail in the same way that I can choose the image/icon that represents a module or course.
SOLUTION UPDATE! In the page containing your Arc uploads, use the "3 dots" menu next to the title of the video. https://community.canvaslms.com/docs/DOC-13748-50736820149
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