Neos\Media\Browser\Controller\AssetController::updateAssetCollectionAction PHP Method

    public function updateAssetCollectionAction(AssetCollection $assetCollection)
    {
        $this->assetCollectionRepository->update($assetCollection);
        $this->addFlashMessage('collectionHasBeenUpdated', '', Message::SEVERITY_OK, [htmlspecialchars($assetCollection->getTitle())]);
        $this->redirect('index');
    }