File Upload: Error

<!-- SASS: src/stylesheets/_components/file-upload.scss -->
<!-- JS: src/js/file-upload.js -->

<form class="usa-form-large">
    <fieldset>
        <legend>File Upload</legend>
        <span>Files must be in .pdf format and less than 2 MB.</span>

        <!-- Start File Upload Input -->
        <div class="vaux-file-upload-wrapper" data-file-upload-trigger>
            <label for="fileUpload">
        <span class="usa-button" role="button" tabindex="0">Choose file(s)</span>
      </label>
            <input type="file" name="filesToUpload[]" id="fileUpload" multiple="" data-trigger-error-state="true">

            <div class="vaux-file-list-wrapper hidden">
                <!-- Validation - Error -->
                <div class="usa-input-error hidden">
                    <span class="usa-input-error-message" id="input-error-message" role="alert"># files failed to upload</span>
                </div>

                <h5>Uploads</h5>

                <ul class="vaux-file-list">

                </ul>
            </div>

        </div>
        <!-- End File Upload Input -->

    </fieldset>
</form>