I created and saved a part then exported it as a .step file as I've done multiple times. I printed the .stp and found that I needed to modify it a bit. When I opened the AD_PRT file "Imported STEP file" is in the design explorer under Features and I have no access to the original sketches to modify parameters... I've done this multiple times with no problems. I checked other AD_PRT files that had been exported to Step files and the original sketches are still there. Any idea what I did to cause this?? I don't want to repeat it...