We are running a small experiment where 0.3% of viewers will see an auto-generated thumbnail, instead of your custom thumbnail. We are not removing the ability to create your custom thumbnail, but we hope to gain insights on auto-generated thumbnails for the future.
Replying to @TeamYouTube
Wait, what?! Why the heck do you want to override CUSTOM thumbnails? The ones user has spent time to portrait their vision they had? And how'd user would know difference between auto-generated and custom? Please replace the auto-generated thumbnails created from timeline instead
1:09 PM - 29 Jun 2018
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