This guide was submitted when Garageband's interface was still based on iOS 7/8/9's iCloud Drive app, when the Files app never existed, and you had to have your files saved in iTunes File Sharing to access them.
This is no longer the case, so I've updated the guide based on its new interface.
Start of the Guide
In this guide, I'll be explaining the process of making ringtones using the GarageBand app.
No computer is necessary, and it…