NS Samba Shares on External USB Disk

Sorry for the late answer…

Here customizing Samba is explained: (include.conf or net conf setparm)

The NS8 System logs page should give some insights. You could choose your samba instance “samba*” to just show the samba logs.

Maybe you need to enable debug logging on the samba-dc to get more information, see Setting the Samba Log Level - SambaWiki