The download option at the top right corner of the review (proof) window gives you multiple download options:
– File: downloads the original video, PDF file or image
– File with Annos: downloads the PDF file with the annotations and comments. OR a PDF of video frames with comments.
– Comments (JSON): downloads all the comments as a JSON file
– Comments (text): downloads all the comments in a TXT file
Comments in a downloaded PDF are compatible with Acrobat