I can print a drawing (originated in Acad 2017) to a pdf with layers - all ok. Try doing a (a different drg.) in various ways with Plant 3D, but do not get any layers. Anyone any ideas as to where I may be going wrong in the set up - cannot find any differences in the drg. setup. Have attached two drawing - IO Centre layers ok, BGR drg will not layer in pdf. The attached drg. is the troublesome one