Attach notes to highlights in PDF
There should be a function to add text/handwritten notes to highlights/or anywhere in the document in PDF reader. After adding the the text/notes, the text box can minimize into an icon next to the highlighted area.
The notes can be compiled and exported/email/printed with or without the document. Information (page no of document/highlighted passages) can be displayed together with/without the notes when exported. This provides easy reference to the notes.