You can now save videos to a playlist with a single tap!
Tap the Save icon to add a video to your most recent playlist or your Watch Later playlist
Tap Save again to choose another playlist or create a new one
More info → https://goo.gl/ZE9tEr pic.twitter.com/GLPSsWHpct
This sucks, i used to add multiple copys of the same video in my playlist, i know i can loop the video but im not always on pc. So please add that we will be able to do so on mobile! If you would look at some data you will found out thats actually quite common thing to do!