Cannot add remaining album songs to library.

Sometimes, I will add a single song from an album to a playlist (which also adds that single song to my library). This is usually from radio, however, when I do this, if I try to add the rest of the album to my library, the button that would be "Add to library" shows as "Download", and there is seemingly no way for me to add the rest of the album songs to my library without either clicking them individually, or removing the entire album then re-adding it, which also removes the song from my playlist.

It's a poor user experience, and I'm praying that I've just overlooked some menu somewhere.