I am generating an assembly with a SW part and three STEP files which were output from Altium Designer. If I import the files, everything works great. The problem is whenever I delete any of the STEP imported objects and then try to import it again. It doesn't show up. I have to close down the program and then restart it again so I can open up the new STEP file. Seems to me I am missing a step during the deletion. What could it be? Thanks for your input!