Problem with Attachments at the PO Line Level

Up until a couple of months ago, we could add attachments at the PO line level and those attachments would transmit with the PO to the supplier.  However, this functionality has stopped working.  The navigation has been Purchasing Administrator -> Purchase Order Summary -> {query the PO#} -> {click on the line} -> View Attachments.  A specific example is when we need to convey to the supplier a one-time shipping location or if we need to include a mock up of business cards or something special to that PO.  I suspect that we are not the only ones experiencing this.