https://theintercept.com/2020/02/13/audios-missionarios-converter-indios-amazonia/
The Intercept Brasil (TIB) received audios, from an anonymous source, which reveals that the newly appointed general coordinator of isolated Indians, has the function of converting Indians to Christianity, a practice prohibited in Brazil.
Silvana Lisboa and Felipe Milanez, the journalists that report this news, embed the audios in the middle of the storytelling to to prove that the TIB has possession of audio and for the reader to see that they exist. Of course, it also have the transcript of the audio, for those who can't listen.
On the text they also use a lot of links to other news that complete the story. Public records from Brazil's Public Ministry, law articles, public sentences, twitter comments are used too.