Hi, I have an axisymmetric model that I would like to export a 2D cross-section of, ideally to STEP and maybe IGES as well.

I used Intersection Curve to generate curves for the cross-section in a 2D sketch. I suppressed all the parts I don't want to export. However, I can't get SolidWorks to save the sketch as STEP or IGES. I've played around with the Save As Options quite a bit, but checking "Export sketch entities" has no effect. No matter what, I either get a blank STEP file or an IGES error ("No available entities to process through IGES"). 

This seems like a trivial task, and I'm not very experienced with SolidWorks - so I'm guessing there's something obvious I'm missing. Does anyone have any ideas?

I attached the files in case that's helpful. I'm using SolidWorks 2019 SP5.0. The sketch I want to export is called EXPORT SKETCH.