See improvements to CAD file positioning when linking and importing. OBJ and STL files are now supported as file types for importing into your models.
Pick Level
In the model, pick the level for the position of the CAD file when it is imported or linked. To choose any defined level in your project, use the Place at control when importing or linking a CAD file. The base level of the CAD file will be set to the selected level. See Import and Link Options.
Import STL and OBJ files
You are now able to import OBJ and STL files directly into your Revit models. See Import a CAD file.