Very informative video for a beginner at assemblies and joints. That’s me here.
I noticed that there are several diffences in our version of Fusion 360. I just enabled the Preview UI thinking that may help but it don’t.
As built joint doesn’t exist for me. And the reset position option doesn’t seem to exist. So when I test move my joint manually the parts don’t reset to their starting point. So far I have been unable to figure this out.