public function saveFileToTmpDir($fileId)
    {
        $baseTmpPath = $this->getBaseTmpPath();
        $uploader = $this->uploaderFactory->create(['fileId' => $fileId]);
        $uploader->setAllowedExtensions($this->getAllowedExtensions());
        $uploader->setAllowRenameFiles(true);
        $result = $uploader->save($this->varDirectory->getAbsolutePath($baseTmpPath));

        if (isset($result['name'])) {

            $fileNameComplete = $result['name'];
            $name = explode("_", $fileNameComplete);

            $prefix = preg_match('/product-import/',$name[0]);
            $fileName = preg_match('/[0-9]/',$name[1]);
            $counter = preg_match('/[0-9]/',$name[2]);

            if ($prefix == 1 && $fileName == 1 && $counter == 1 ) {

                $result['tmp_name'] = str_replace('\\', '/', $result['tmp_name']);
                $result['path'] = str_replace('\\', '/', $result['path']);
                $result['url'] = $this->storeManager
                        ->getStore()
                        ->getBaseUrl(
                            \Magento\Framework\UrlInterface::URL_TYPE_MEDIA
                        ) . $this->getFilePath($baseTmpPath, $result['file']);
                $result['name'] = $result['file'];
                if (isset($result['file'])) {
                    try {
                        $relativePath = rtrim($baseTmpPath, '/') . '/' . ltrim($result['file'], '/');
                        $this->coreFileStorageDatabase->saveFile($relativePath);
                    } catch (\Exception $e) {
                        $this->logger->critical($e);
                        throw new \Magento\Framework\Exception\LocalizedException(
                            __('Something went wrong while saving the file(s).')
                        );
                    }
                }
            } else{
               return false;
            }
        }
        return true;
    }