I am currently facing two problems:

1. I am creating an assemble animation, but the animation video is skipping a couple step in the explode view at 00:45 seconds. I am not sure what is happening I have tried adding specific explode step without avail. It's skipping explode step 43 through 46.

2. I also added a motor to all four wheel in a separate motion study and imported them. The wheel don't spin during the animation though.

I have attached my assembly which includes the animation. Any help would be appreciated.