If you connect your device to your Mac using a USB cable and don’t see the device in the Finder sidebar, see If your device doesn’t appear in the sidebar when syncing.
In the Finder on your Mac, select the device in the Finder sidebar. To turn on Wi-Fi syncing, see Sync content between your Mac and iPhone or iPad over Wi-Fi. You can connect your device using a USB or USB-C cable or using a Wi-Fi connection.