Attachments during receiving in oracle 12.1.3

I am on Oracle 12.1.3 and my business users use iprocurement to create a receipt for standard purchase orders. Oracle forms are not used.

Now, they want to be able to attach a document whe creating a receipt. Document is essentially a delivery note or a timesheet for the consultant.

There seems no way to attach documents when creating receipt for standard purchase orders in iprocurement. Can someone confirm or share thoughts why this is so ?

When creating work confirmation, attachment functionality is there but we dont use work confirmation.

Thanks, Vishal.