Validation not working on FIle or File Advanced Field

Metabox Version 4.8.7
I want File field required but the validation is only working of INPUT fields not for File Type or File Upload Field http://i.imgur.com/DP5Wbnq.png

    $meta_boxes[] = array(
        // Meta box id, UNIQUE per meta box. Optional since 4.1.5
        'id'         => 'standard',
        // Meta box title - Will appear at the drag and drop handle bar. Required.
        'title'      => esc_html__( 'Standard Fields', 'your-prefix' ),
        // Post types, accept custom post types as well - DEFAULT is 'post'. Can be array (multiple post types) or string (1 post type). Optional.
        'post_types' => array( 'post', 'page' ),
        // Where the meta box appear: normal (default), advanced, side. Optional.
        'context'    => 'normal',
        // Order of meta box: high (default), low. Optional.
        'priority'   => 'high',
        // Auto save: true, false (default). Optional.
        'autosave'   => true,
        // List of meta fields
        'fields'     => array(
            array(
                'name' => esc_html__( 'Image', 'your-prefix' ),
                'id'   => "{$oyeprefix}file1",
                'type' => 'file',
                'max_file_uploads' => 1
            ),
         
        ),
        'validation' => array(
            'rules'    => array(
                "{$oyeprefix}file1" => array(
                    'required'  => true,
                ),
            ),
            // optional override of default jquery.validate messages
            'messages' => array(
                "{$oyeprefix}file1" => array(
                    'required'  => esc_html__( 'File is required', 'your-prefix' ),
                ),
            ),
        ),
    );