This iMac is OS 10.13.6 iPhone not visible in Finder.
Hi Alwyn
It will not be visible in Finder. As far as I know, it was only with macOS Catalina that all actions regarding iOS Devices were handled through Finder.
In macOS 10.13.6 (macOS High Sierra), iOS Devices are handled through iTunes.
When you connect your iPhone (I presume it is an SE - old version or new?) is it recognised by iTunes at all?
You should see this:
If you do, and Click on the iPhone icon (Yellow arrow), what do you see?
On the Left you should see:
On the Right, varies things including:
My question about the version of iPhone SE was because if it's the new one, it may require the latest version of iTunes.
Ian