@YTCreators How do I opt out of the "auto generated thumbnails"? cause after spending two days on one for someone's video it's a little infuriating not being able to see it.
While that feature isn't currently available. You can however use our Send Feedback tool to submit the suggestion, here's how: https://goo.gl/WdI0BK . You may not get a response, but we do review all of the feedback and use it to prioritize requests!