Please ignore the previous. I discovered that I needed to be in PC Mode the first time I connected and the problems seemed to resolve the PC based drivers loaded and updated and the Phone reapeared in Connected devices. It Seemed to limit the files visible on the Phone while in PC Mode but it must allow synching of certain files.
Sorry if my temporary frustration steered you wrong.
FYI when you are USB connected pulling down the top menu and tapping USB connection is the way you switch between PC Mode, Windows Media Sync, USB Mass Storage...
Hope it helps. Still a Smartphone Newbie!