Hiya, if a member has marked an article as not helpful and added a comment, where would I see that comment? I can't see this in any of the metrics or community analytics?
I believe it's on the search page -> export search results via CSV
If you don't see it on your search page, you'll have to contact support to get it enabled. Once enabled, you'll be able to export every article/post in Community, and a ton of data behind each.