Put it just before the reveal in your edit, then follow it with a short reaction sound once the answer is out. A message alert works well as the next beat, and a laugh lands best after the reveal.
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This is a short rising suspense sound effect that lasts about 1.75 seconds, with a swelling tone that climbs steadily and holds the listener in anticipation. It feels tense and uneasy, like something important is about to happen, and it works best when the payoff is still a moment away.