I recently installed iTunes 18.104.22.168 on Windows 10; after the installation it would no longer recognize my iPad Pros (either one of them). The iPad would ask if I wanted to grant access to photos, etc., but iTunes itself would never show the iPad as being connected. Prior to the upgrade I had no problems connecting.
I found the solution at: https://support.apple.com/en-gb/HT204095 .
First, unplug an i-devices you have hooked up. Then, navigate to:
%ProgramFiles%\Common Files\Apple\Mobile Device Support\Drivers
Find either usbaapl64.inf or usbaapl.inf. Right click on it, and pick Install.
Reboot your computer, then give it another try. If it doesn’t work, the link above has a few other suggestions you can try, but this worked for me.
Hopefully this will help someone else with similar issues (or act as a reminder to me in the future ).