I am having the same problem with my new WD My Cloud EX4100, so I will post here with something I have found. I have fiddled around with three of my computers (all of which are running Windows 10 Home) and the NAS. Two of them (a desktop that is connected via Ethernet cable to my router and a laptop that is connected via Wi-Fi) see the NAS only as a storage device. The other, a laptop connected via Wi-Fi, sees the NAS as a storage device and a computer (as it should). The only difference between the two that I can see is this: the one that works thinks the network is public, while the ones that don’t work think the network is private. In reference to the above about SMB, I am running SMB3 on all the computers in question. I am guessing that if one can make the computers think they’re on a public network, one will be able to see the NAS as a computer. (Whether or not having it set up like a public network is good or is what you want is a different matter.)
I’ve messed around some more and noticed that I was seeing slightly different settings in the Windows Control Panel for these various network settings. What I learned was that the laptop where things actually work is Windows 10 Home build 15063. The computers where things don’t work is build 16299. So, seems things got broken by the new Windows build.
As always, any ideas on this are much appreciated!