@TeamYouTube When I upload a video on mobile, I change the thumbnail via the creator's app. However, the thumbnail doesn't update until about a week after my upload. Is there an easy way to fix this without uploading on a computer?
Thanks for clarifying. Please send a feedback report directly from YouTube with these steps: https://goo.gl/WdI0BK . While every report may not get a direct response, we review everything and use the details to investigate and fix issues.