I am a AE user having some frustrations trying to get up to speed with Motion.
I have a clip corner pinned to a TV screen. The TV screen hase slightly round edges and so I want to scale up the clip slightly, and then mask it, so that it fills all of the screen.
My problem is that when I increase the scale, the corner pin kicks in and puts the clip back to the shape it was before. I don't know how to make the scale happen after the pin. After, I don't know how to nest the clip.
You will need to do a Mimic Source from the Transform Pop-up menu. Go to page 70 in the Motion 3 Supplemental Documentation, it has pictures so I think you will get a better sense of what to do from the manual as opposed to me typing it out. Hope this helps.