I set up a event frame. I want to get the output with"outputs at close", but there is no value on display. what's the "use preview". what's wrong in my setting? Thanks a lot.
Nothing wrong with your settings. As the name suggests outputs at close meaning that you will be able to see the result in the duration attribute only after event frame is closed. Using preview will shows the events if any between time periods and also shows output details(duration) for the closed event frames
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