$40 isn’t expensive in principle for these PDFs. Thanks, I’ll take a look. Also, a few days ago, I found a great online tool https://pdfguru.com/blog/how-to-edit-pdf-on-mac in a post about how to edit PDFs on a Mac. I only recently started using a Mac, and the built-in editor didn’t really satisfy me. Overall, in my opinion, this tool works perfectly if you use PDFs frequently.