Requisition Attachments not available in Supplier PO Communication Email

Summary:

We have a functionality to send purchase orders to suppliers .The purchase orders are automatically created from requisitions. In the requisition there is an attachment which is marked to suppliers . The suppliers are receiving email but it has only po pdf attachment and not the attachments from requisition in PROD.

The issue is happening  only intermittently for a supplier .They are receiving the attachments on some cases. Even when we tested with same supplier in lower instance the supplier is receiving emails with attachments (both requisition and po pdf).

 Note: The Maximum File Size is set to 500 MB in purchasing setup and communication method is updated properly for the supplier. The attachment size is less than 100 kb.