public function update_poster_image( $request ) {

    $post_id = $request['post_id'];
    $poster  = $request['poster'];

    if ( ! $attachment = get_post( $post_id ) ) {
      return false;
    }

    // We add ssl => 1 to make sure that the videos.files.wordpress.com domain is parsed as photon.
    $poster = apply_filters( 'jetpack_photon_url', $poster, array( 'ssl' => 1 ), 'https' );

    $meta                         = wp_get_attachment_metadata( $post_id );
    $meta['videopress']['poster'] = $poster;
    wp_update_attachment_metadata( $post_id, $meta );

    // Update the poster in the VideoPress info.
    $thumbnail_id = videopress_download_poster_image( $poster, $post_id );

    if ( ! is_int( $thumbnail_id ) ) {
      return false;
    }

    update_post_meta( $post_id, '_thumbnail_id', $thumbnail_id );

    return true;
  }