iPhone not visible in iTunes
When I plug my iPhone into my Mac using the USB cable iTunes does not see the iPhone. I therefore cannot synch music or do back-ups. Please can someone advise any suitable solution.
Mac is running High Sierra 10.13.6 (Can't update to newer OS due to age of Mac)
iTunes running on Mac is 12.8.2.3
iPhone is running 13.1.2
iPhone 8