This is something possible in the source Smartsheet, but once you put it in a Dynamic View, say to share with different vendors and keep privacy in between them, downloading the data into a CSV is possible, but not the accompanying conversation log. This would be a great fix to the Dynamic View interface.
One step further, it would be even better to download the entire Dynamic View applicable to any user in a zip file containing all the row information, conversation logs, AND attachments.