Inability to connect my iPhone SE to my MacBook Pro running Sierra
I'm running MacOS Sierra 10.12.6 on my mid 2015 MacBook Pro. I don't want to update the OS because I have apps that won't work if I do. When I try to connect my iPhone SE (14.6) to my Mac, I get a notice that a software update is required to connect my iPhone. The App Store doesn't offer an iTunes update (I'm currently running 12.2.8.3). I have precious photos and videos on my iPhone that I am unable to back up to my Mac. And music on my Mac I want to put on my phone. Eventually I plan to buy a new Mac with up-to-date OS - but till then want to run my Mac on Sierra. Any (not too technical) help would be much appreciated.
MacBook Pro 15″, macOS 10.12