Prevent Authors from seeing other authors media files

Wordpress Privilege Author Media

// Prevent Authors from seeing other authors media files 
add_filter('parse_query', 'my_parse_query' );
function my_parse_query( $wp_query ) {
  // Only applicable for Media Library && Media Upload Dialog
  if (! preg_match('/wp-admin\/(?:upload|media-upload|admin-ajax).php/', $_SERVER['REQUEST_URI']) ) {
    return;
  }
  global $current_user;
  $user_roles = $current_user->roles;
  $user_role = array_shift($user_roles);
  if ($user_role && is_string($user_role) && strtolower($user_role)==='author') {
    $wp_query->set( 'author', $current_user->id );
  }
}

As hlotvonen said, this code seems to conflict ACF .
So I recommend you to add .
if($wp_query->query_vars['post_type']!=='attachment'){ return; }

Regards.