FBDI to upload PO attachments

Summary:

We are currently working on bulk loading Purchase Orders into Oracle Fusion Cloud Procurement using the File-Based Data Import (FBDI) process. While we are able to successfully import PO data using the standard FBDI templates, we require guidance on how to include attachments (such as PDFs, images, or supporting documents) as part of the PO import process.
We understand that attachments may need to be uploaded separately via UCM or through ERP Object Attachment Services, but we are looking for an end-to-end process or supported workaround to associate attachments with POs during or after FBDI import.
Specifically, we are seeking: