@TeamYouTube Hello, I am unable to add videos to a playlist, it’s not mine, but I have permission to add videos in it. I could add videos in it yesterday but now I am unable to.
Does this happen across browsers/devices? Have you tried clearing your browser's cache and cookies to check if you are able to see the videos? More info: https://goo.gl/oSxzzw . Also, have you tried using a different device or browser to check if that resolves the issue?