Here’s how to transfer ownership of a prototype to a Team:
1. Go to your prototype homepage.
2. Click the More button (next to Assets under your prototype name).
3. Select Transfer Ownership.
4. Enter the team owner's (the person who purchased the Team account) email address and click Yes, Transfer Prototype.
An email invite will be sent to the recipient which must be accepted. Upon accepting the invite ownership will be officially transferred and the whole team will be able to access it.