The short answer
An invitation does not automatically share your personal content. A project must be assigned to the intended team and shared with it. Find this under Switch project → Project properties → Team. The selection may save immediately. Members can use shared projects according to their role, while viewers are intended for read access. Models in a shared project are visible to every team member, viewers included. Only the person who uploaded a model can edit, move, or delete it. Chats remain personal, so a team project does not give you access to other members' chats. To show someone a chat, share it with a link.