You can add comments to viewpoints, viewpoint animations, selection and search sets, clash results, and TimeLiner tasks. When you add a markup, a viewpoint is automatically attached to it.
You cannot add any comments, markup annotations or tags in Autodesk Navisworks, but you can view comments, markups, and tags attached to viewpoints.
Review tools (markups and tags) enable you to add annotations to viewpoints, and clash detection results. The Clash Detective feature is available for Autodesk Navisworks Manage users only.
Using review tools is mutually exclusive to using navigation tools (see Product-Specific Navigation Tools), so that when you add markups or tags you cannot navigate and vice versa.