Renew Contingent Worker in Design Studio is not available to add document records

Hi team,

I am working with Sandbox, and I set up the Renew Contingent Worker in Design Studio using the Create Work relationship, but it is not available to add document records with the custom line manager role. The document records section is visible. But the add button disappears in the Document Records section.
Do you have any idea what the issue is?

Thank you for your help!

Claudia