$photo['backend-class'] = ExternalResource::NAME;
$photo['backend-ref'] = json_encode(['url' => $url, 'uid' => $uid]);
$photo['type'] = $mimetype;
$photo['backend-class'] = ExternalResource::NAME;
$photo['backend-ref'] = json_encode(['url' => $url, 'uid' => $uid]);
$photo['type'] = $mimetype;