YouTube Music now allows users to download songs, albums and playlists for offline listening2
Starting with the latest update, YouTube Music gains the option to save songs, albums, and playlists for offline listening, Google confirmed recently.
If you already updated to the latest version of your smartphone, you will find a new Save Offline option hidden under the Menu icon highlighted by three dots. You will then be asked whether you want to save just the audio, SD video, or HD video.
After the app saves your desired file, you will be able to access them offline by tapping on your profile photo and selecting Offline mode. Keep in mind that if you're using an iOS device, you'll be able to swipe left on a song in a playlist to make it available Offline.