merging PDFs loses attachment

[KRISHNAVIB]

Hi There,
I was trying to merge two PDFs in which one of the PDF is having attachment (docx file). After merging both PDFs using OpenPDF , we can see the attachment which was there in one of the PDF is not in the final output file i.e: Merged File.
IS OpenPDF capable of handling attachments while merging PDFs.
Can anyone help?

[mkl-public]

Merging PDFs with PdfCopy only merges page-level material from the source PDFs, not document-level material like general file attachments. If you want to merge PDFs and keep document-level material from one of the documents, open that file in a PdfStamper and use importPage to add the pages from the other documents.

[KRISHNAVIB]

Tried that, but that doesn't carry attachment. Can you elaborate?
Thanks