Things may look a little different in UpContent as of 09/14/2022, check out the new update here.
Folders are how you control which team members have what level of access to your topics or collections.
Once you have done so, you can begin adding members to your team.
Once they have accepted their invitations, you can begin collaborating by assigning additional folders (if needed).
Your team members should then be able to access and interact with those topics or collections, and the suggestions within.