We'd like to help. What happens when you try changing the thumbnails? Do you see any error messages? Also, does this happen across devices? Let us know.
@TeamYouTube
I can't change my thumbnails since yesterday. I stayed all day changing all and NOTHING works! Help me!!!!!!!!!!!!!!!!!!!! My channel is http://youtube.com/amarelocriativo tks
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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