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It would be extremely helpful to have the ability to download a PDF (or image, or other file types) with comments included. Alternatively, could there be a way save out just the comments as it's own ...
Sometimes we need to share commented docs outside of our organisation with folks that do not use Dropbox (or any cloudservices at all) an export function of the comments would be very helpful in those cases. It would probably also increase the likelihood of people inside our organisation agreeing to use this function rather than the commenting functions that Office, Acrobat, etc have build into their software.