I seem to have stumbled upon the same issue, but I just upgraded to OS5 from OS3.
It was working fine on OS3.
I still haven’t figured out what the issue is.
I got the latest windows, I have enabled SMB1.0 and I have made sure NFS is enabled.
Yet it’s not in the network discovery.
I have tried WD’s own Network Discovery tool.
No luck there.
I have done everything this tutorial has said:
https://support-en.wd.com/app/answers/detail/a_id/25436/h/p2
I can see the files and folders if I use SSH using WinSCP.
I might have found a solution here:
Also, remember that you need to enable FTP (Anonymous None) and NFS on the share.
If it’s not enabled, it won’t show up.
Once you have gotten to the WD MyCloud’s IP, you need to RIGHTCLICK the folder you want to connect to.
Then hit “connect to network”.
If you try to double click the folder, it will give an error.
Remember to click “use another login type”
Just as my example below (Norwegian language text).
