Doesn't it just take a while to process and upload? I have encountered this as well. 
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Naw, I've already had it ready when it goes live and uploads, this is the 1st time it happened to me
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Just to confirm, does this happen across browsers/devices? Also, is this with a particular video or multiple videos? Let us know!
Thanks. Twitter will use this to make your timeline better. UndoUndo
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Same thing happened to my girlfriend
@SillyDrifloon with one of her videos. Guess she's not the only one this would happen to. :o -
YES OMG THAT HAPPENED TO ME LAST WEEK!! Ok so what happened to me was, on my creator studio, the thumbnail wouldn’t appear but sometimes it would. Even if you tried selecting a preset thumbnail it still wouldn’t change it, but after a few days it fixed itself. (1/2)
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