Via: MacRumors
Apple Music is making it easier to curate your playlists on iOS 26.4 personally. Previously, you had to add a track to a playlist one at a time. Now, there is a multi-select option in the settings that lets you choose as many playlists to include the song in as you like. You can long-press on a song or tap on the three-dot menu and select Add to Playlist. You'll spot a new multi-select button in the bottom right corner.