Annotation and Collaboration (Cord Integration?)

I just tried out retool and it's pretty cool, but I wanted to see if there was a way for users to annotate and comment on designs together. I found an article and a forum post about integration with cord.com, but the instructions there do not seem to work and seem out of date. Does anyone know if cord and retool still work together. If not is there any other way for users to markup or add comments retool screens without having to do so in a separate app? https://retool.com/blog/build-together-in-retool-with-cord-comments-and-annotations