public com.google.cloud.speech.v2.BatchRecognizeFileMetadata.Builder addFilesBuilder() {
      return getFilesFieldBuilder()
          .addBuilder(com.google.cloud.speech.v2.BatchRecognizeFileMetadata.getDefaultInstance());
    }
<pre>
Audio files with file metadata for ASR.
The maximum number of files allowed to be specified is 15.
</pre>

<code>repeated .google.cloud.speech.v2.BatchRecognizeFileMetadata files = 3;</code>
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/BatchRecognizeRequest.java