@TeamYouTube if you have a connection on your personal hotspot theres a black line between it and the video (iphone se 12.1.2 latest youtube update)pic.twitter.com/NBMBWKbcl5
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It only appears on the device that hosts the hotspot when someone is connected and yes all videos
Understood. To help the right team better investigate, please send a feedback report from the device with these steps: https://goo.gl/WdI0BK . While you may not get a direct response, we do review everything and use the details to identify and fix issues. Thanks.
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