...
Note that it is usually not necessary to manually upload users in bulk with Upload users. To keep maintenance work down, you should first explore forms of authentication that do not require manual maintenance, such as integrating your learning environment with your Active Directory or letting the users create their own accounts via email-based self-registrationconsider automating this procedure via the "Automated Upload" functionality provided by Dual Code.
Below are some tips and additional details depending on what you are trying to accomplish with the "Upload users" tool
...