Place it as the final reply after the confusing message plays, not under the explanation itself. Lead in with Olha a Mensagem to tease the incoming audio, follow with this clip, then close the sequence with Abriu o Áudio for a quick follow-up beat.
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A very short Portuguese voice clip of someone saying they are not understanding you, delivered in just over one second as a flat, confused reply. It gives off a funny, slightly awkward feeling, like a conversation has suddenly lost the plot and nobody wants to pretend they followed it.