Copy Annotations

[manathan1984]

I have a PDF that I am editing by merging each page with some additional content (e.g., adding page numbers), but as I do that, I am losing all annotations to internal objects (sections, references, figures). Is there a way to recreate all such annotations? The document is the same, with the only difference in the added page numbers.

Alternatively, is there a way to edit a page of a PDF document and save it in the same document? I am asking because the process I follow now is largely the following:

from PyPDF2 import PdfReader, PdfWriter

reader = PdfReader("my.pdf")
writer = PdfWriter()
for page in reader.pages:
        page_number_pdf = ...  # (a page with only the page number)

        page.merge_page(page_number_pdf.pages[0])
        writer.add_page(page)

After this loop, the reader pdf has all the internal annotations (links), while the writer has none. Any suggestions are very welcome!