Place it at the reaction point in the middle of a short edit, after the visual setup and before the reply beat. Follow it with Tuturu for a second anime reaction, or put it before a To Be Continued freeze for the closing beat.
关于此声音
This is a very brief anime-style vocal clip, just 0.86 seconds of a single ahh sound. It lands as a light, surprised reaction, the kind of small exclamation that makes a moment feel cuter and more playful without adding dialogue or background noise to the scene around it at all.