How can I save my handwriting note to pdf file?

I’ve made a lot of handwriting notes on the PDF file. How can I save all these notes to PDF file itself?

Hello, do you mean that you would like to make those handwritten files saved in another PDF file or in original file?

I mean how can I save all handwritings with the origin file as a new file.

Sorry for the late reply here. Please feel free that those handwriting notes will be saved in PDFs automatically.