User guide

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and select Flatten All from the menu
l To flatten all annotations from the annotation later to the content layer, and save the PDF file in
one step, in File menu, select Save As, and then Flattened PDF. This flattens all annotations,
including form fields, sticky notes, links, and other markup annotations.
For more information, see Annotation layer and content layer.
Nitro Pro 9 - User Guide