Put it right after the question it is answering, as the whole reply in a chat edit, then follow it with a WhatsApp message sound to suggest another message is coming. That order keeps the stall clear and leaves the next beat open for a decision.
關於此聲音
This is a short 1.7-second German voice clip saying 'Muss ich mal schauen', the everyday phrase for I'll have to see. The delivery is calm and deliberately non-committal, turning a simple request for an answer into a gentle stall. It feels hesitant and a little cheeky, like buying time without saying no, and it works because the shrug is built into the words themselves.