We'd like to help. What device are you using? Also, does this happen across devices? Let us know.
@TeamYouTube On my videos lately I’ve been putting thumbnails on them but they won’t save or they will disappear after a few hours do you know why?
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I’ve been using a iPhone and when I’m on a computer on my account it shows the thumbnails but not on phone or any of my friends phones it just shows my YouTube banner for it
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