iTunes to iPhone 7 Communication
I have a MAC desk computer. It is running Mojave 10.14.6 Operating System. The computer is older and that is as far as I dare update it. I have iTunes 12.9.5.5 and I am trying to connect my iPhone 7 to iTunes. I am trying to use my old iPhone 7 as an iPad for music. The iPhone 7 is up to date with iOS 14.2. The Photos app on my MAC recognizes the iPhone 7 and I can transfer pictures. However it will not show up in my iTunes so I cannot transfer music. When I first hooked up the iPhone 7 I had a message that said I would need a software update to communicate. However by the time I could respond to the message it was gone and I cannot get it to come back up. I am not sure what update it is talking about since everything is up to date. The Apple support says I can do this but I can't figure it out. Any suggestions would be greatly appreciated. Thanks
iMac 21.5″, macOS 10.14