Hi brianaja,
Please use Export Audio Mixdown in Cubase to export the desired tracks of your project.
Cubasis offers many ways to import audio and MIDI files such as iTunes File Sharing, WiFi Server, Dropbox, AirDrop, external hard drives etc.
Please find descriptions for each option in the the MediaBay chapter of the Cubasis in-app help and choose the one that matches best to your workflow.
Hope that helps!
Best,
Lars