After uploading a prototype that has been created in Studio, commenting is broken.
A user is required to sign in to view the comments at all. This wouldn't be a big deal if it were communicated via the interface but there is no indication of that.
Also the point comments scroll along the screen so they become useless and are unrelated to the element they have been placed on.
Not sure why these behave differently than when uploaded using Sketch + Craft. This is a vital feature for communicating with engineering and stakeholders for review.
This would absolutely have to be fixed in the future for me to continue using Studio.