Put it at the very end of a chat screenshot edit, after a WhatsApp message sound that opens the exchange, so the sign-off closes the scene. Follow it with nothing else, and use Olha a Mensagem earlier if you need a prompt that makes someone check the chat first.
關於此聲音
This is a short 2.5-second voice clip in Portuguese, with someone saying they are going to sleep. The delivery is calm and matter-of-fact, like a quick goodnight message sent before putting the phone down. It feels tired, relaxed and a little playful, the kind of sign-off that ends a late chat without a long goodbye.