Thumbnails for 4K videos

clark42clark42 Washington StateRegistered Users Posts: 1 Beginner grinner
Now that Smugmug can handle 4K videos, I've uploaded several but I want to change the thumbnail and I can't get anything to work. I've tried 1920 and 3840 jpg files and nether work. Is this a bug or did I miss something. The help function still says only HD videos are accepted.
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