So you have added textures to the part level of your part in IronCAD and transferred it to KeyShot for rendering but instead of the part textures showing in KeyShot the part comes in red. The most common cause of this is the part's texture Image Projection setting is set to Natural (a setting that KeyShot doesn't accept). Close KeyShot, go back into IronCAD, right-click your part and go to SmartPaint. Under Image Projection, select any of the options other than Natural (Automatic usually works well). Then transfer to KeyShot again and the textures should appear.