Share Contract Documents in Supplier Portal with Non "Primary Party" Supplier Parties

Summary:

Is there a way to share Contract documents in the Supplier Portal with other Supplier-type Parties listed on the Parties tab that are not the "Primary Party"?

Content (required):

In a Buy intent contract type, we have success sharing documents with the Supplier contacts for the Supplier who is chosen as the Primary Party. However, if we have defined "Additional Party Roles" on the Contract Type, where those Roles' Sources are also based on the Supplier master, those additional role Supplier contacts cannot see the shared documents.

Example by Party Role:

* Customer = US Business Unit

* Supplier = ACME Brick Inc. **Primary Party** - can see docs in Supplier Portal