Hi, and welcome to Lectora Online!
Lectora Online has it's own review feature. You can add reviewers into a shared project's project team. These reviewers are sent an email with a link and credentials. The reviewers are able to log into Lectora Online and add notes into a shared title as part of their review.
More about sharing a title and adding reviewers:
http://lectora.com/Share-a-Title-Lectora-Online-Course-Software-video/
