public com.google.cloud.telcoautomation.v1.File.Builder addFilesBuilder(int index) {
      return getFilesFieldBuilder()
          .addBuilder(index, com.google.cloud.telcoautomation.v1.File.getDefaultInstance());
    }
<pre>
Optional. Files present in a blueprint.
When invoking UpdateBlueprint API, only the modified files should be
included in this. Files that are not included in the update of a blueprint
will not be changed.
</pre>

<code>
repeated .google.cloud.telcoautomation.v1.File files = 9 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-telcoautomation/proto-google-cloud-telcoautomation-v1/src/main/java/com/google/cloud/telcoautomation/v1/Blueprint.java