In the "Appearances, Scenes, and Decals" tab, I attempt to drag and drop an appearance, stainless steel knurled, to a part, (per the instructions on the menu), the appearance shows up in the display manager but never actually shows up on the part. I have adjusted the scale to make sure that was not the issue. Any ideas?
You just found why the appearance does not seem to be applied. No worries, it is actually there.
Do a quick PhotoView rendering and you will see it there.