With OpenPLi 7.0+, you don't need to use smbpasswd anymore, you can just use passwd to change the password, it will by synced with the samba credentials database.
And if no linux user with that name exists, smbpasswd will fail, so that might be the issue as well. The -a option creates an SMB password for a linux user, but it doesn't create the linux user. Use "adduser" or "useradd" instead.
Thanks. All works as I want to work.
I create another user with access only to one folder (with movies ) on hdd everything else is NO ACCESS for average mortal user .
Thank you