Awesome. If you want to go back to the SMB share and set it to Public: No, it should still work and security would be tightened. All's well that ends well.______________________________________________________________________
Edit - Now that you're familiar with adding users:
In Shared Folder permissions, "Others" shouldn't be set higher than Read. This would match "Guests Allowed" in the SMB share.
This is useful for media shares, where you may want to allow visitors Read access to your media.
With users created in OMV, for transparent access from Windows clients;
In a Shared Folder, setting Others to None and the Group Users to Read/Write, matches Public: No in the SMB share. This will keep certain data shares private, from those who are not in the users group.
Now I did crank up security as you advised, and it is still working!
Aso tried tuning samba for more speed, and the speed got much better.
Thank you for everything