Click inside the text field and type your note. Add as many Sticky Notes as you desire. Save the PDF document when you are finished adding notes by pressing "Ctrl-S" simultaneously.

Adding Text Notes to a PDF Select the Text Box tool from the Drawing Markups panel. Click, or click and drag, on your document to add a box with a colored border, and type your observations in it.

You can import and add a PDF to OneNote as a file attahcment or printout image, or convert and add PDF to OneNote. Here's how!

In the latest version of iOS and macOS, Apple has updated the Notes app to support inline PDFs, which means you can insert a PDF into Notes and then read, annotate, and collaborate on the document.