Hey, Mike,
Man, are you gonna make me fess up to my silly mistake? 
I was able to figure out how to “mount” the WD My Cloud disk using SMB. I have never had to deal with anything other then the default network mount in the past (afp). I just logged into my WD My Cloud console and retrieved the STATIC IP address I assigned to the device many months ago during initial setup. Once I had the IP address, I just did the following:
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Finder --> Connect to Server
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Entered smb://IP address/, clicked on “+” to add to the list of Favorite Servers
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I then highlighted the new server in the list of Favorite servers and clicked on Connect.
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Viola, all mounted and roon is now happy.
Let me know if it would assist the community if I take screen shots and attach them to this thread (assuming I can attach/upload screen shots). I would be more than happy to do so if you feel it is of value to the community.
However, after an all night import (I have somewhere between 18,000 - 22,000 tunes), I am discovering roon has not loaded more than a few albums. Not sure if any artists are missing yet. For example, I have all of Rush’s albums with a few remastered ones for about 26 albums. Roon only found 5… I am digging around on the forum to see if I can find any similar issues and solutions. BTW, I entered a separate thread for this issue.
So far, I am liking Roon. If I can get the missing album issue resolved, I will most likely take on an annual subscription for this year.
Thanks, Mike.
Dale