Okay, I just figured out this is a problem only on Firefox. On Chrome, I can upload custom thumbnails. And I'm not sure if this is a problem on YouTube's or Mozilla's end. Is there a chance that you guys could look into it, or should I ask Mozilla about it?
@TeamYouTube... I like making Custom thumbnails for videos. Even if they're rather small videos, putting custom, eye catching videos helps get more eyes on them. You yourselves know this... So what's going on with the thumbnail uploading process?pic.twitter.com/UAEzbEcBT0
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