Fal::createSysFile() 

\nn\t3::Fal()->createSysFile($file, $autoCreateStorage = true); 

Creates new entry in sys_file Searches all sys_file_storage entries to see whether the path to the $file already exists as storage. If not, a new storage is created.

\nn\t3::Fal()->createSysFile( 'fileadmin/image.jpg' );
\nn\t3::Fal()->createSysFile( '/var/www/mysite/fileadmin/image.jpg' );
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| @return false|\TYPO3\CMS\Core\Resource\File

Source Code 

public function createSysFile ( $file, $autoCreateStorage = true )
{
	$file = \nn\t3::File()->stripPathSite( $file );
	$storage = \nn\t3::File()->getStorage( $file, $autoCreateStorage );
	if (!$storage) return false;
	$fileRepository = \nn\t3::injectClass( FileRepository::class );
	$storageConfiguration = $storage->getConfiguration();
	$storageFolder = $storageConfiguration['basePath'];
	$basename = substr( $file, strlen($storageFolder) );
	$sysFile = $storage->getFile($basename);
	// @return \TYPO3\CMS\Core\Resource\File
	$file = GeneralUtility::makeInstance(ResourceFactory::class)->getFileObject($sysFile->getUid());
	return $file;
}
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