Thanks for raising this. There are also other factors to look into when adding videos to series playlists like if the video is already in a series playlist. More info about it here: https://yt.be/help/Lces . If this still happens, let us know.
@TeamYouTube Is this a YouTube glitch? The videos I'm adding to my playlist are my own videos uploaded to the same channel. I think a few people are experiencing this as well. "Video uploaded to a different channel cannot be added to a series playlist."pic.twitter.com/FWQipG65ZB
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The videos I’m adding are not in any playlist. I’m 99% sure it’s a glitch. I’ve been adding videos to that playlist for 6 years and this just happened now.
End of conversation
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