@TeamYouTube How long that error will be happening where I'm trying to put private video in series playlist but says video is from different channel. Both video and playlist are on same channel?
Hmm, can you check if you have a verified account? Also, a video cannot appear in more than one series playlist & only videos uploaded by you and that you have the rights to can be added to a series playlist. More info here: https://yt.be/help/Lces .