Student names can be shortened or changed as you see fit.
For staff names, just use initials. That is enough for students to recognise.
See this explanation of how the Secure Key protects student identity.
For more on Privacy and Data Protection...
Email addresses are one-way encrypted and cannot be unencrypted.
They can be used to cross-match with existing students in the database.
So, re-importing to change groups is easy and won't overwriting existing data.
Pick the spreadsheet you want to open.
The app will then try to work out which columns to use. It can cope with a wide variety of different spreadsheet layouts but will ask for help if it is not sure.
Before you import, you can check the report to confirm it is doing what you want.
The group column is optional but highly recommended to make administration easier.
Tap on "Import" once you are happy with the lists.
The report shows you exactly what will be imported.
If there are errors, it will show you clearly where they are so you can correct them and try again.