Help with robodk

Hi guys, need help

Me need import my 3d model in Robodk, I want to be used as a tool.
Tell me how to do this and whether it will work?

i try add file .stp format - fail.

it`s worked! But due to the fact that I have a composite model that I have combined into one, it is still difficult to position it correctly relative to the robot. Next, I will think about how to specify that it is the lower roller that is the working part. Then I will add the positioner and try it. Another such point and the question is whether it will be possible to additionally register signals in the code? In this installation, there is still a pneumatics, which at some points of winding will have to work out.

Another problem, please tell me if the program can make it clear that the 7 axis of the robot control is the shaft of the positioner, which rotates it in both directions.

i change positioner on ext.axis by Kuka, it`s can work?