HOWTO | Move a Garage Band pro ject from iOS to OS X
1 Start work on iOS
Start a project in GarageBand on your iOS device. When you have taken it as far as you can on the device, tap My Songs to go to the project list, then tap Select and tap on the project you want to move. Tap the cloud icon and choose Upload Song To iCloud. This may take a couple of minutes.
2 Move to the Mac
Open GarageBand on your Mac (make sure you have the latest version – see top-left). Go to File > iCloud > Open iCloud Song. You will need to have made sure that you have iCloud Drive active in the settings on both devices for this to work. Most iOS projects will require little storage space.
3 Keep working
With the project on your Mac, you can perform more detailed editing and arranging, and use third‑party plug-ins. You can’t take it back to iOS, yet it is still in iCloud. You can move it to local storage if you prefer. ≈- click its name in the title bar, then the folder just below to jump to it in Finder.
4 Remove songs from iCloud
You can delete any project from iCloud using Finder on your Mac by dragging it to the Trash. In GarageBand on iOS, repeat the steps taken to upload your project; this time the cloud icon offers an option for you to remove the track from iCloud, which helps if you need the space.