iPhone 16 running OS 18.6 does not appear in Finder on Mac running Sequoia 15.6

Check the Finder settings to see whether they say to show iOS devices in the sidebars of Finder windows.

Dogs5677 wrote:

Updated software on Mac and iPhone to latest versions.

iPhone does appear in Music on Mac and in system settings.

rebooted both devices

reset trust and privacy on iPhone

In Music verify you clicked the caret to spin open to show Devices...if not

move your mouse to the right side to reveal the caret...

Same for Locations in your Finder Sidebar if not showing;

... check you Finder>Settings as suggested in above post by Servant of Cats