Did you share the folders you want to share on the Windows 10 computer?
I have 3 pcs on a network. One desktop running Win 10 and another desktop running Vista. They are connected to the network via Ethernet. The other pc is a laptop running Win 10 and connected via WiFi.
The laptop can see and share files from the Vista desktop. The Vista desktop can see and share files from the Win 10 laptop. They both can neither see or share files from the Win 10 desktop. They show it as a media device only.
The Win 10 desktop can see and share files from both the Win 10 laptop and the Vista desktop.
Any ideas on what the problem might be with the network?