Place it after the reveal in a chat-story edit, not under dialogue. Pair it first with a WhatsApp message sound for the incoming text, then follow it with a laugh track button to close the beat on the group's reaction.
このサウンドについて
Amandasdasda is a short soundboard clip lasting just over four seconds, shared as a WhatsApp audio with a nonsense title built around the name Amanda. Without a confirmed source or line, its appeal is the abrupt, random energy of dropping an unexplained name into a conversation, which makes it feel silly, confusing, and primed for a reaction.