iPhone won't sync photos or music after iMac update to Big Sur
My iPhone 11, running iOS 15.2, will not sync with my iMac recently updated to Big Sur (Mac OS 11.6.1). It appears to backup the iPhone fine, but will not proceed further than reading the Photos file - just a moving hatch that will never complete. The Photos in my iPhone don't sync, and neither does the music that I have selected. I cannot eject the iPhone in Finder, and have to unplug it - but the iPhone in Finder keeps spinning and won't disconnect. When I updated to Big Sur, there was an Apple patch that showed up briefly that alluded to potential help connecting - but I have been unable to find (and download) that patch again. Any help?
iMac 27″, macOS 11.6