Make sure your account is verified and see our recommended image size & resolution for custom thumbnails: https://goo.gl/T0AbeJ . Keep us posted!
@TeamYouTube thanku for your help and reply me but my problem is not solve i clear all cache and cookies and update my chrome browser but my recently post video thumbnail is not showing help me.pic.twitter.com/zLigb7QISk
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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