Help with Windows network access Shared drives

Ok, first using guest is not always the easiest so actually creating a user with a password might be a more fool proof solution.
Secondly you might have a tricky environment where your NAS only supports old Samba protocols while your Windows 10 would demand the latest ones.

I think you have two options either follow this thread to change the authentication options via user.conf as explained here

Or more performant follow this thread for fstab based mounting