Otherwise, the new pdf file will be added to the original pdf file. Next, if you want to keep a copy of the original document unmodified, please select “Duplicate” from the File menu so that you can now process a new copy of the original document.It should be opened by the Apple ‘ Preview’ App. To merge the pdf files, open the first pdf file.If you don’t know how to do it, just follow the below steps: Sometimes you have a 10-page pdf file and you want to add another 10-page pdf file as well. Replace or Move Pages Between the PDF files.
