Render frame of cloth sim

This is frame 39 of a cloth sim, rendered from the viewport. How do I render it properly? Using F12 or the render button only renders Frame 1.

ETA: I can apply the cloth sim modifier, that works. Is there a way to do it that doesn’t require that?

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This seems to be working now, not sure why it wasn’t before. A different example. I think the problem was that I was running the animation with Alt-A rather than using the play button in the timeline.

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