The feature is currently not available but you can submit the request via "Send Feedback": https://goo.gl/WdI0BK . Appreciate it.
Hey @YouTube, why can't I choose "add to watch later" from my notifications tab..? @YTCreators @TeamYouTubepic.twitter.com/0R2ge9SGWT
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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