@TeamYouTube hey some of my thumbnails are not displayed?! Any tips on how to fix that? (I already try to re-upload them) 
The thumbnails look fine on our end. Do you see this happening across devices/browsers? Keep us posted.
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I did. I clean my cache too. I just tried on a PC I didn't work on... and you are right. It's a bit strange and confusing, but as long as the viewers are seeing the thumbnails. I'm fine. Thanks for your help!
Thanks. Twitter will use this to make your timeline better. UndoUndo
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