@TeamYouTube hey some of my thumbnails are not displayed?! Any tips on how to fix that? (I already try to re-upload them) 
I already did... here again http://fr.cloud5mins.com orhttps://www.youtube.com/channel/UChFOuhUf12hIVEdcnaSUNzA …
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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!
End of conversation
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