I save many PDFs as child thoughts under a parent that describes the area of research those pdfs are relevant to. It would be useful for AI note generation to be able to use the contents of the PDFs. In this way a thought that contains a PDF could have a summary of the PDF as a note and I wouldn't have to open the PDF and read it entirely to know what it contains. Similarly, the parent though could contain a summary of the PDFs contained in its child thoughts. While I have focussed here on PDFs, this could work well with other file types as well.