Place it at the exact moment a message appears on screen, after the on-screen tap and before any reply sound, so the edit reads as one continuous phone interaction. Pair it with App Button Tap first, then follow with a short reaction sound such as Bruh to mark the reply.
关于此声音
This is Vivo's short Grain notification tone, a 1.6-second system alert built for incoming messages. Its brief, grainy texture makes it feel light and unobtrusive rather than loud or urgent, like a small tap on the shoulder instead of a full alarm. It comes from Vivo's internal notification sounds, where it is listed under the name Grain.