/**
* {@inheritdoc}
*/
public function persist(File $file) : bool
{
// only write temporary, i.e. not yet persisted files, to backend file storage
if ($file->isTmpFile()) {
// use streams for writing to backend file storage
$stream = fopen($file->getTmpPathname(), 'r+');
return $this->filesystem->writeStream($file->getKey(), $stream);
}
return true;
}
