"Custom Thumbnail" doesn't always do its job @YouTube, about a quarter of my uploads nowadays doesn't input them despite saving changes multiple times before the uploading is complete. Please fix this.
An error message doesn't show up, you upload the thumbnail on custom thumbnail, but YouTube sometimes picks a default one instead.
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Understood! What device/browser are you using to upload a custom thumbnail? Also, while clearing your browser's cache and cookies or using another browser on desktops, updating or reinstalling the app often fixes most issues. Let us know if the issue persists.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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