iTunes Music
I can no longer download albums that I have purchased in the past onto my iPhone 7 ?
Question marked as
If you are sure it's the same version of the album that you bought, and if you haven't moved countries since buying it, it should show for redownloading : Redownload apps, music, movies, TV shows, and books from the App Store, iTunes Store, and Apple Books - Apple Support
If it doesn't check to see if you've hidden it from there : Hide and unhide music, movies, TV shows, audiobooks, and books - Apple Support