Unable to sync my iPhone with my iMac using USB
This problem has gradually got worse over the last year. I have a late 2013 iMac with OS 10.15.7 and an iPhone 8 with iOS 14.0.1. I have always updated using the USB ports, however the connection has become intermittent and now back-up/syncing does not take place. I have tried all the four USB ports with two USB cables (I believe the cables are authentic Apple products). For a while I was able to sync by restarting the iMac with the phone attached by USB, unfortunately this no longer works. Disconnecting and reconnecting the phone makes no difference. I have read that you can sync using WiFi but that requires clicking that option in the iPhone window on Finder which I now cannot open. Images attached.
Thanks :)
iMac 21.5″, macOS 10.15