How do Administrators and Collaborators work in a Memory?

The Popster who created a Memory can add other people to help manage it.

Collaborators can add their own public Pops (moments) and delete Pops (moments) they added themselves.

Administrators can approve followers and add or remove collaborators.

If the Popster who created the Memory removes an Administrator or Collaborator, they decide whether that person keeps watching the content or loses access to the Memory entirely.