“Open port 445, 137-139 on your router and on a remote computer map the network drive as //YOUR IP/YOUR SHARE NAME or open port 21 and do FTP.”
Those are options as well, however, I strongly do NOT recommend them.Unless you do not care about your data and/or security
Why? Those are NON secure protocols. Very easy to hack.
There is a solution already, but you have to use the new software/version, “WD My Cloud Desktop utility”