So far with iCloud Music Library I have been able to download smaller 100 song playlists. I do this my clicking the ... button then saying Make Playlist Available Offline. When I pressed this for my Summer 15 playlist, it had 102 songs in. Since then, on my mac, I have added 5 more. I am wondering, does the playlist just stay in sync and download the extra 5 songs automatically, or does it have to be told to download the extra ones every time?