How to automatically download music from library onto android.

Salutations StoneBacon,

With an Apple Music subscription you can download music you've added to your library for offline use. Add and download music from Apple Music

On your iPhone, iPad, iPod touch, or Android device

1. Open the Apple Music app.

2. Touch and hold the song, album, or playlist that you've added from Apple Music.

3. Tap Download.

You can also download a song by swiping left over the song and tapping the Download button.

Thanks. 

Hey there, StoneBacon!

From here, we'd recommend reaching out to Apple directly for further assistance. They'd be the best hands possible to help walk through any features or settings that may need to be updated for you. You can reach them at: Apple Support

Kindest regards!

Hi StoneBacon,

Understood. Do you have Automatic Downloads turned on in Settings > Music? This will automatically download added songs to your library to the device. Learn more here: Add music to iPhone and listen offline - Apple Support.

Cheers.