How does the peer review of projects such as Codeflix Churn and Warby Parker Funnels work?

I’ve completed a couple of the projects so far. In each set of directions for the project it suggests answering questions and creating a powerpoint file or similar presentation as well as a .sql file of queries used for project. The directions go on to suggest sharing work with peers on Codecademy getting feedback based on the included rubric. Where would I share those work products and also see others solutions?

To the best that I can see, there is no good way of doing peer review, other than posting to the forums; however, all posts I have seen have been dead (as this one is).