Absolute must! I had assumed that this was possible. After creating a very large notebook with 60 pdfs and annotations of students' papers I just assumed I could export/email each paper (node) with my comments for that pdf to the specific student. Instead I am forced to export the entire notebook with all linked pdfs. My cumbersome work around was to clone the notebook and remove all other pdfs....way too time consuming but necessary for me to extract the needed pdfs with annotations. Until this is fixed I will use other annotation apps when I intend to export pdfs.