Inactive slice in sequencer

Sorry for my english language too.

I made a slicer (cut off) and it works very good in realtime.
Thx *UnrealCG *for the tutorial (3D Printer Shader - Material Tutorial - [UE4] - YouTube).

Now I would like to play an animation with the slicer in movement in the sequencer but the slicer move but the asset isn’t cut. Why ? What can I do to have a correct result (the floor must appaer step by step)?