Penta Machine provides a standalone simulator at https://sim.pentamachine.com and an integrated simulator in their 5-axis milling machines' control software, Kinetic Control.

The simulator can display a mesh along with the path the tip of the tool takes while running your post-processed G code. However, the origin must be identical for the mesh and tool path to line up. Unfortunately, exporting a mesh from Autodesk® Fusion® uses the often arbitrary origin that is defined for your part, rather than the origin chosen in your CAM Setup that is used by your post-processed G code.

The Export Model From Setup Add-In will allow you to easily select multiple solid bodies, along with your CAM Setup, and will export those bodies as a mesh with the correct origin to align with any G code post-processed from the same setup.