Private asset libraries are only visible to you and the team members assigned to them. Team members are assigned a set of access permissions that allow them to read, edit, and publish assets. This article details more information about private Polyverse asset libraries.
To create a private Polyverse asset library, in the sidebar, click on the Asset Libraries link under the Asset Management heading. This will take you to the main Asset Library page. From here, click Create New Asset Library to make a new one.
Polyverse will present a dialog asking for the new library’s name and to set whether it’s a public or private library. Enable to Private Library toggle to make the library private, then click the green Create New Library button.
To manage an asset library's team members and access permissions, click the Edit Library button located in the top right corner of the library information area.

From the dropdown, select Manage Members.

To invite a user, enter their email, choose their access permissions from the New User Permissions dropdown, and click the blue Invite button.