You can't change the frames. It drapes the whole time. And if you add more frames it goes back to undraped at the new frame. So if you had say 40 frames and draped it then decided you need another 30 frames so add them, frames 1-40 will stay draped, but 41 to 70 will appear as though you haven't draped it, unless of course you rerun the simulation.

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