You need your iPhone or iPad to show up in Mac's Finder to create a backup, copy files, change accessibility settings, restore the device, and more.
The solutions below will help fix the problem of your iPhone not showing up in Finder, Mac not recognizing your iPhone, or "Trust This Computer" not showing up. All of these options apply to all Macs and MacBooks running macOS Catalina, macOS Big Sur, and the current macOS Monterey.