How to add and view annotations in Unity Reflect Review

Unity Reflect Review is a real-time, immersive design review solution for designers and architects to drive more collaborative design reviews.

As part of our series highlighting key features, this video will walk you through how to add annotations in Unity Reflect Review to give all project stakeholders the ability to leave feedback and comment on designs.

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I have the last version but the annotation button doesn't appear, why? How can I add it?