I used to click "..." then Save when I was looking at a song. Now when I click the "..." there is no more "Save".
I had the same problem but I figured it out. On the song or artist page you have to swipe left on the song and it will save or remove from your library. I’m not sure why they made this change because the save button worked just fine.
If you press on the heart icon on the now playing screen that will save the song alternatively called "liking" the song.
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