Dynamic phase animation

Is it possible to create an animation of the dynamic excitation during earthquake duration? sampling interval of time-acc is 0.01 sec,, duration of the motion is 45 sec, so i selected the max steps as 4500 and substep as 1 to create an detailed animation that shows the every step. But when i try to create animation for just dynamic case, the last step appears in selecting box? what am i missing?

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