For those in a similar pickle in the future, I found the answer here (circa 2017): Can't add the network shared location
Cliff note version: smb://IP/public/music
When mounting the WDMYCLOUDHOME on a Mac, it shunts the ensures to a “public” folder and this needs to be designated when creating your Network share.
2+ days wrestling with that and such a boneheaded and convoluted fix. C’est la vie.