Added as help for others
Enabled SMB1 support
WIN+R run optionalfeatures
enable SMB1.0/CIFS File Sharing Support
NAS would not MAP
I could use CMD Net use Y : \\MachineName\ShareName
it would complete successfully but drives still not show
As workaround used WIN+E and entered \\IP-address\shared-folder
This would create shortcuts on 'My Computer' so I could access data
Final fix in my case - I have MalwareBytes installed, I contacted Malwarebytes ... they provided data gather tool, analyzed results sent me FRSTfis tool and a very very long set of customised scripts, that the tool run automatically.
It run - took about an Hr, but as soon as finished Mapped Drives appeared.