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PDFs are one of the most used file formats for many reasons. These days, opening a PDF is pretty easy, no matter which device you're using. However, editing a PDF isn't that simple unless you have a PDF editor
Quick tip: Any changes made to a PDF in Preview are saved automatically. If you want to keep all the original separated documents, make sure to duplicate your files before combining them. To do this, click on your PDF, click "File," and then click "Duplicate" in the drop-down menu