Question: how to open fbx file in revit?
Answer: File menu > Import > Link Revit or Link FBX > Manage Links dialog > Files tab > Highlight an RVT file or an FBX file. > Turn on Show Reload Options. > Click Reload. File menu > Import > Link Revit or Link FBX > Manage Links dialog > Presets tab > Highlight a Revit preset or an FBX preset. >