src/Filesystem/Local.php
public function upload($key, UploadedFile $file, $overwrite = false)
    {
        $filePath = $this->getFilePath($key);
        if (file_exists($filePath) && !$overwrite) {
            throw new \RuntimeException(sprintf('The file with key "%s" is exists.', $key));
        }
        return $file->move(dirname($filePath), basename($filePath));
    }
public function upload($key, UploadedFile $file, $overwrite = false)
    {
        $filePath = $this->getFilePath($key);
        if (file_exists($filePath) && !$overwrite) {
            throw new \RuntimeException(sprintf('The file with key "%s" is exists.', $key));
        }
        return $file->move(dirname($filePath), basename($filePath));
    }
{@inheritdoc}