Video thumbnails let viewers see a quick snapshot of your video as they're browsing YouTube. After your video is finished uploading, you can choose a thumbnail from the three options YouTube automatically generates, or upload your own.

Learn more with these Help Center articles: https://support.google.com/youtube/answer/72431
https://support.google.com/youtubecreatorstudio/answer/7024632
https://support.google.com/youtube/answer/9288567

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