code: def serve_concatenated_pdf_from_disk(
          filenames: Iterable[str],
          offered_filename: str = "crate_download.pdf",
          **kwargs) -> HttpResponse:
      
      pdf = get_concatenated_pdf_from_disk(filenames, **kwargs)
      return serve_buffer(pdf,
                          offered_filename=offered_filename,
                          content_type=MimeType.PDF,
                          as_attachment=False,
                          as_inline=True)
docs: Concatenates PDFs from disk and serves them.