Put it at the very end of a chat-style edit, after the last message has landed, so it closes the exchange. Open the same edit with the Hola Tururururu sound, then let a WhatsApp Message sound mark the final reply before this farewell finishes the sequence.
關於此聲音
This is a very short spoken clip, under a second long, with a voice saying 'Hasta luego' in Spanish. It lands as a light, playful farewell rather than a formal goodbye, with a casual tone that makes a sign-off feel like a joke. The phrase comes from Bendita TV.