Hey there! Just to confirm, are you adding a thumbnail on a video you're uploading? If so, learn more about it here: https://yt.be/help/STpv . Otherwise, please share more specifics so we can look into it.
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It shows thumbnails on Chrome/Edge/Firefox for Windows 10. It also shows up for Android. I think it's a cache issue not YouTube.
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If on an Android (not sure the steps for IOS) go to settings > Apps > YouTube. Click Force Stop. Click the Storage button then click Clear Cache... if that doesn't work try reinstalling the YouTube App. Steps to clearing the cache on a browser varies by the browser.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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