To start, upload a list of users via Bulk Upload. This uploaded list will automatically create a new group attribute for all users in the file. The new attribute applies to both users that are already in the program and users that are being added to the program for the first time (this means that Duplicates will still get the new group attribute).
Then, create a custom group. Under Filters, select Custom > Bulk Upload. Then type the name of the uploaded file into the Custom Bulk Upload box.
Note, Status and other criteria are optional when creating a custom group. However, if you have Created or Invited users in the custom group, they may not receive push notifications and they can't access targeted content until they complete registration. The Created and Invited users can still receive emails and see content previews for untargeted content.
Once your custom group has been saved, you can use this group like any other group in your program!
Why Don't My Uploaded Users Have Any Custom Attributes?
If your program leverages user verification or SSO with custom attributes, we will only have the username, email, and bulk upload attribute (see above) until they complete registration. Therefore, the added users will not appear as part of any special attribute groups like department, location, etc. until they are Registered users.