Geometry for part models incomplete | Mimic

After seeing some videos about the mimic feature in RMS so I gave it a shot. In the videos, the models of V5 parts like motors, screws, and the cortex were all very detailed. When I used Mimic, all of the parts were made of primatives (just boxes or cylinders). I have all of the plugins installed and I’m using Chrome.

Additionally, this issue is making it hard to keep all 4 wheels touching the ground at the same time because they are rigid cylinders.
Any help would be greatly appreciated.
Screen Shot 2021-03-09 at 2.29.15 PM