await readFile returns undefined

[diegolaciar]

readFile returns undefined when try read the contents of m4a audio file.

I can read content of txt files.

It is possible to read file content of other file formats than txt files ?

Thanks,

    let fileExists = await FileSystem.fileExists(
      "audio_message.m4a",
      FileSystem.storage.temporary
    );
    console.log("fileExists audio_message.m4a",fileExists);
    // returns 'true'

   const fileContents = await FileSystem.readFile(
      "audio_message.m4a",
      FileSystem.storage.temporary
    );
    console.log(`read from file: ${fileContents}`);
    // returns   undefined !!!!!
   //  and the file exist and I can play the audio file in a player.