@TeamYouTube I haven't been able to add ad breaks to videos all day. Is this a site wide issue?pic.twitter.com/ssfFmw4cBl
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That's odd – if you have many browser tabs open, try to close most of them except the one you’re using for YouTube. Also, if you haven’t already, refresh your browser & clear cache & cookies. If nothing works, send a feedback report from the account here: https://yt.be/help/feedback