Can no longer update playlists or backup iPhone
I have an iPhone SE/IOS 16.6.1 & 16" MBP/Big Sur 11.7.4. If I upgrade my Mac OS, my CAD program won't run on anything higher & has switched from purchase to subscription model. My CAD version does everything I need so have no need or desire to pay $130 monthly fee.
Previously (as recent as a month ago) I could connect iPhone to Mac & "A Software Upgrade is Required to Connect to iPhone" box popped up. This was NOT correct, I always clicked "Not Now" & it opened the Music app with my phone in the sidebar. Clicking on the phone icon brought up the usual backup window & it would backup, then sync pics, songs, movies, playlists, etc. Have done this for a couple years now.
Today, I plugged the phone in, clicked "Not Now" but the phone fails to appear in the Music app, even if I manually launch it.
Any ideas on what changed (I have certainly not changed anything) or how I can simply sync my phone without an OS update to either device? I don't mind updating the phone IOS but had avoided it thinking it might cause this very issue I now face.
Any help would be greatly appreciated.
iPhone SE, iOS 16