I haven’t had the occasion to import a STEP file for some time. The last time I did I was using 2016. When the imported assembly was opened I was able to extract components from the assembly. I just tried it in 2020 release and I am unable to do that – what changed and how can I extract components. The model has solid bodies but they cannot be opened individually.
SW might not be the problem. It might be how the step file was created. I download step files from vendor sites almost every day and don't have any problems.