Use gallery-manager widget in bootstrap modal window

[ArCoLab]

I use renderAjax to load form in modal window. Gallery widget render view (buttons etc..) but not works (don't upload files). It working OK without modal... Please help.

Controller:

public function actionAddAnnounce(){
$announce = new Announces();
return $this->renderAjax('add_announce', compact('announce'));
}

View (add_announce)

$form = ActiveForm::begin(['action' => '/user/add-announce', 'id' => 'new_announce']);
echo GalleryManager::widget(
[
'model' => $announce,
'behaviorName' => 'galleryBehavior',
'apiRoute' => 'user/galleryApi'
]);
ActiveForm::end();

[ArCoLab]

Just need to add id of ActiveForm parameter in widget...