Q: iphone 6s connection to itunes

Hello there, Darrylph.

It sounds like you're iPhone is not being recognized in iTunes when connected to your Windows 10 computer. The following Knowledge Base article offers up some great troubleshooting recommendations:

iPhone, iPad, or iPod not recognized in iTunes for Windows

Restart

Turn off your computer and your iOS device or iPod, then turn them on again.

Update your computer

Check to make sure that you've installed all required updates for your computer.

Update iTunes

Check that you have the latest version of iTunes installed on your computer.

Make sure your iOS device trusts your computer

If you connect your iPhone, iPad, or iPod touch to your computer and see "If you have not connected your iOS device to this computer before, unlock the device and tap Trust," make sure that your device trusts the computer.

If you use Windows XP and you see the trust alert on your device repeatedly, make sure that you installed iTunes. Learn how to resolve a repeating trust alert when using Windows XP. You might need to reset the lockdown folder.

Check the USB cable

Verify that the 30-pin to USB cable or Lightning Connector to USB cable is free of debris and not damaged. If another cable is available, test with that cable instead.

USB cables that are bundled with third-party products or accessories might work only to charge those products and might not transmit data. Also, if you're using a third-party case or extended battery pack, try removing the case and connecting the Apple-supplied USB cable directly to your device.

Verify that Apple Mobile Device Support is installed

iOS devices require Apple Mobile Device Support, which should be automatically installed with iTunes. To verify whether it is installed, follow the steps appropriate for your Windows operating system below.

Although the steps mentioned only reference through Windows 8, the steps are very similar for Windows 10 as well.

Thanks for reaching out to Apple Support Communities.

Kind Regards.