Unable to link my IPhone X to ITunes
After re-importing my CD's back into ITunes I wanted to sync them to my IPhone. The phone has never been linked, so when I attached the phone I am asked to setup as a new IPhone, or restore as a backup. My Iphone has been regularly backed up, but ITunes states that the last backup was in 2017.
How do I link my IPhone to ITunes without loosing anything?
Thanks
MacBook Pro 17″, macOS 10.13