/** * @return void */ protected function setFileExtensionFilter() { // Don't inject the filter, because it's a prototype $this->fileExtensionFilter = $this->objectManager->get('TYPO3\\CMS\\Core\\Resource\\Filter\\FileExtensionFilter'); $this->fileExtensionFilter->setAllowedFileExtensions($this->imageFileExtensions); $this->selectedStorage->addFileAndFolderNameFilter(array($this->fileExtensionFilter, 'filterFileList')); }