Follow Aroged, the new feature provides a save button found in the YouTube Music app. When users are listening to an album or song, they will see a tab at the bottom where some songs will be playing in the next few minutes or hours. Along with that, a new Save button appears at the interface and allows users to save all those songs as a Playlist.
New features of YouTube Music are being rolled out gradually to users
However, this Save button is not yet available to all users, which means it could be server-side delivery and happens in phases.
9to5Google also spotted a new mode called adrenaline coming to the YouTube Music app on Android and iOS. In the US version of YouTube Music, it appears in the activity bar on the main screen as the last option, while some areas of this option appear as the second option.
Like the add-on list feature above, the adrenaline option is not yet available to everyone. Along with that, it can also appear in different ways that users can learn more, especially between Android and iOS platforms. All of these releases are rolled out in phases.