An imported STEP file is converted to a triangle mesh on import (making it much like a typical .stl or .3mf file) which means that slicing all happens as one would normally expect.

Multiple file-format choices exist, but you might want to consider taking additional steps when saving your parts for 3D printing.

I want to do some very basic editing of STEP files, e.g.: Read in two or three STEP files, align the components with respect to two faces or two axes, and save Read in a STEP file, delete a few ...

Find out what is an STL file and how you can open and view an STL file with .stl extension in Windows 10. It is native to the stereolithography CAD software.