API for File Download

Good day,

In the attached screenshot, when you click on "Download" it will download a PDF file, and this PDF file will have the comments and annotations embedded directly into the source file.

Is there a way to get that PDF programmatically? Some API method I am missing, or somehow that I can get this file with a post request etc?

I have a requirement where I need to get that PDF file without needing the user to Download and Upload it back into my system. I hope this makes sense.

Kind regards