How to create Motion study with an imported part in Solidworks?

Hello i am trying to do some motion study ( circular motor ) with an assembly saved as sldprt file , where the parts can be not recognised
But it does not work
Does some one has a solution for this case ?
Thank you

1 Answer

What Jonathan said is correct. If the assembly was saved as a part (like pictured) then it eliminates all of the data you need. You shouldn't even be able to open any of the parts individually, instead it will give you "Edit Feature" instead of "Edit Part"

It has turned from separate parts, to separate surface features.