I want to insert some pages from one open pdf file into another. Unlike Acrobat, I cannot simple just drag them from one window to another. There is a support page that says: "To insert pages from another PDF from your local library, please click Page>Insert>From PDF button. Then select a different PDF document from your local library. ", but "From PDF" is not an option. Another support page says: "After opening the PDF file in the program, please right-click the page on the left thumbnail side to choose Insert Pages, you can choose to insert the page from a file or insert a blank page, but right-click doesn't do anything. I am using a Mac, using the track-pad.