...
Once the config page loads up, select the "Contents" tab and scroll down to the Network content box. Click the button that says "Add Manual Network Content" and enter the NAS path plus credentials. Select "Save" and then scroll up to the top of the page and select "Save Changes".
Bare in mind that the NOTE: SAMBA Version 1 must be enabled for the MMS to see the NAS content.
Note: The server will need to index every track before any content will populate under local content. . This can take several hours depending on the number of tracks in the library.