When working in Autodesk Navisworks and BIM 360, it is possible that others may be working on the CAD files you are currently reviewing. For example, if you are coordinating various disciplines on a project, then you may have an NWF file referencing numerous design files. During the iterative stages of the project, any member of the design team could potentially be modifying their CAD files. Similarly, if you are coordinating models in Navisworks from BIM 360 Glue, another team member may have modified a file since your last session.
To ensure the data you are reviewing is current, Autodesk Navisworks and BIM 360 provides a refresh function to reopen the files that have been modified on the disk since commencing the review session.