YouTuber Logic Pro X Life did a detailed demonstration of the iDAM (Inter-Device Audio & MIDI) available in macOS with iOS 11. This new standard makes it easy for macOS DAWs to communicate with iOS apps.
Thanks to @Issiewizzie for pointing this out! The easiest and most reliable way to use your iPhone or iPad with Logic Pro X (or any other Mac DAW) is to use the newest version of IDAM. In this video we take a look at how it works and how to use it.