Table to find PO line level attachments

Summary:

We can see line level attachments on the PO page. However, we don't see the attachment details for all the lines in the fnd_attached_documents table. We also checked fa_fusion_soainfra.wfattachment table. Out of the 3 lines, we can see attacment for only one line in the fnd tables.

Which tables can we use to find the attachments for all the po lines?

I have included a screenshot. The attachment details for the first two lines are not available en the fnd tables. The attachment details for the Line 4 is available in the fnd tables.

Any help is greatly appreciated.