As a ReadCube Papers Enterprise user, you can create private groups in which you and your team members can share references and PDFs amongst yourselves.
To Create a shared group library...
Step 1: Click the "+" icon next to Shared Libraries
Step 2: Give your Shared Library a name and choose who'd you like to have access to it. You can select all team members or add specific people.
Note - you will need to hit "Enter/Return" after typing in your team members' emails so there is the gray box around it.
Your new library will automatically be created and you will see the new folder open and ready for you to add things to it.
You can always edit folder details including members by clicking the gear icon to the right of the folder name.