saveFileToMediaDir example

$metaData = $this->metadataLoader->loadFromFile($mediaFile, $mediaType);

        $media = $this->updateMediaEntity(
            $mediaFile,
            $destination,
            $currentMedia,
            $metaData,
            $mediaType,
            $context
        );

        $this->saveFileToMediaDir($mediaFile, $media);

        $message = new GenerateThumbnailsMessage();
        $message->setMediaIds([$mediaId]);

        if (Feature::isActive('v6.6.0.0')) {
            $message->setContext($context);
        } else {
            $message->withContext($context);
        }

        $this->messageBus->dispatch($message);
    }