After my tablet had been updated by the Creator update it ceased to be visible on my laptop in File Explorer under Network. I checked under "Advanced sharing settings" that Network Discovery was turned on, and it was, but I subsequently found that "Make this PC discoverable" was set to "off". When I turned that on, the tablet became visible again. I would have thought that turning on Network Discovery and making the PC discoverable would have been the same thing, but in that case how could one be on and the other off? I'm probably missing something very obvious here but I'd be grateful for any explanation. Thanks.