i'll try to upload a file (or later multiple files) in FE. This works, like my current code. But how can i get a file reference of this file now?
/**
 *
 * @var array $fileData
 * @var integer $feUserId
 * @return \TYPO3\CMS\Extbase\Domain\Model\FileReference
 */
private function uploadFile($fileData, $feUserId) {
    $storageRepository = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Resource\\StorageRepository');
    $storage           = $storageRepository->findByUid(1); # Fileadmin = 1
    $saveFolder        = $storage->getFolder($this->settings['uploadFolder']);
    // Datei speichern
    $fileObject = $storage->addFile($fileData['tmp_name'], $saveFolder, $feUserId.'_'.$fileData['name']);
    // Dateiobjekt
    $repositoryFileObject = $storage->getFile($fileObject->getIdentifier());
    die(\TYPO3\CMS\Extbase\Utility\DebuggerUtility::var_dump($repositoryFileObject));
    #$newFileReference = $this->objectManager->get('TYPO3\CMS\Extbase\Domain\Model\FileReference');
    #$newFileReference->setOriginalResource($repositoryFileObject);
    return $newFileReference;
}