Turn automatic syncing on or off on Windows
You can sync content automatically whenever you connect your iPhone, iPad or iPod to your Windows device, or sync content manually. To sync content manually, see Sync your Windows device and iPhone, iPad or iPod.
Connect your Apple device to your Windows device.
You can connect your device using a USB or USB-C cable or a Wi-Fi connection. See Sync content between your Windows device and iPhone, iPad or iPod touch over Wi-Fi.
In the Apple Devices app
on your Windows device, select the device in the sidebar.
If you connect your device to your Windows device using a USB or USB-C cable and don’t see the device in the sidebar, see If your iPhone, iPad or iPod doesn’t appear in the sidebar.
Select General in the sidebar.
In the Options section, select “Automatically sync when this [device] is connected” to turn on automatic syncing.
Select Apply.
Before disconnecting your Apple device from your Windows device, select the Eject button 
in the sidebar.