Open the Music app or your music streaming app
Find the song, album, or playlist you want to download
Tap the download icon or the three-dot menu
Select Download or Add to Library, then Download
Make sure you are signed in to your account
Ensure you have an active subscription if required
Connect to Wi-Fi if the file is large
Wait for the download to finish
Open the Downloads or Library section to access offline music
Check iPhone storage if the download does not start
Use the Files app if you downloaded music from another source
Use iTunes or Finder on a computer to sync music to your iPhone