Adding and rearranging pages
One PDF problem that people often encounter involves having multiple PDFs that they’d like to combine into a single file. This is easy to do in Preview.
To combine PDF files, open one of the files, click the View menu, choose Thumbnails, and drag the other PDF file from the Finder into the Thumbnail pane where you’d like that dragged document to appear. Drag it above the first thumbnail if you’d like the dragged pages to appear first; drag it below the other thumbnails to append it to the end; or drag it somewhere in the middle to insert the pages at an in-between location.
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