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Following the release of version 6.1 of Nitro Pro, it is now possible to append a PDF file to an existing PDF when printing through Nitro PDF Creator.
Nitro PDF Creator now enables you to append the content of a newly created PDF file to an existing PDF. What this means is that you can merge the content of both files instead of overwriting the existing PDF document.
Nitro PDF Creator will prompt you when you try to save a new PDF to a location that already contains a file of the same name, and you are then given the option to; Overwrite, Append before, or Append after, the existing document.