Place it at the cut where the pickup changes, after your setup shot and before the reaction beat. Pair it after a Pop Sound Effect Button for a menu select, then let this hit alone on the actual swap so viewers track the change.
About this sound
This is a very short game effect, under a second long, the bright blip that plays in Touhou when a UFO pickup triggers an item change. It feels quick and satisfying, like a tiny reward confirming the swap worked, and it comes from Touhou UFO: Undefined Fantastic Object.