How to download previously generated Purchase and Change Order PDFs in bulk

In Oracle Fusion Cloud, we want to download the Purchase Order and Change Order PDFs for multiple orders in bulk.

We have tried to check for the PDF's using this SQL query:

select * from fnd_documents_vl where title like 'PO_PNPO%'

Using this query we can see that the files exists with document_id as UCM…, so we have tried to get the pdfs from UCM/WebCenter but could not find the files over there.

Please let us know how and from where can we download all the previously generated Purchase and Change Order PDFs.