sims pose problem

I have watch some youtube video on how to add chair objects and animation to my pose but I have a little problem which the object chair is not in the pose in my sims 4 can any help me why the chair is not showing in my pose sims 4

If i said it wrong when I pose a sim on the chair it don't work and when I have the sim stand up right and pose the sim he is off the ground and pose with out the chair.