WD Sync on a Network Drive

I need to sync my network drive, mapped as drive Z:
Why am I unable to add this drive to WDSync?
I am not able to use the FTP of sftp options mentioned in another post.
If this product is unable to back up a network drive, which WD product should I be using?

Hi markcrobinson,

You can follow the article given below for resolution.
https://support.wdc.com/knowledgebase/answer.aspx?ID=11395

If still the issue persists, You can contact WD Support team from the link given below.

To Contact WD for Technical Support
https://support.wdc.com/support/case.aspx?lang=en
The link below will allow you to call support.

That did not appear to address my question.
I need to backup drive Z: that is mapped to my network.
WD Sync and the article you referred to only gives me access to local drives, even if I sign into mycloud.com