Combine or split existing PDF documents - Adobe Inc.
https://helpx.adobe.com/ee/acrobat/how-to/combine-merge-split-extract-pdf-files.html
WebOpen Acrobat. Choose File > Create > Combine Multiple Files into a single PDF. If the file is already open, then choose Combine Files from the right menu. Click Add Files or Add Open Files, or drag files into the Add Files window. You can choose a variety of documents at once, such as Microsoft PowerPoint presentations, images, emails, and more.
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