Create media in shopware 6

createMedia.php

$mediaId = Uuid::randomHex();

        $mediaRepository->create([['id' => $mediaId]], Context::createDefaultContext());

        $request = new Request();
        $request->headers->set('content_type', 'application/json');
        $request->query->set('extension', 'png');
        $request->request->set('url', 'https://placekitten.com/200/287');
        $mediaFile = $mediaService->fetchFile($request);
        $fileSaver->persistFileToMedia(
            $mediaFile,
            'kitten',
            $mediaId,
            Context::createDefaultContext()
        );