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Files downloaded during a workflow session are stored in Simplex’s cloud. There are three ways to download files with Simplex: webhooks, polling, and the download session files endpoint.

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Webhooks and polling

Both webhooks and polling for status offer presigned downloaded URLs you can use. See Webhooks and Polling Session Status for more information.

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Download session files endpoint

You can alternatively download the files directly using either the download session files endpoint. or the TypeScript SDK. Here’s a TypeScript SDK example: 
const zipBuffer = await client.downloadSessionFiles(workflow.sessionId);
const zipPath = path.resolve(__dirname, `${workflow.sessionId}_files.zip`);
fs.writeFileSync(zipPath, zipBuffer);
console.log(`Zip file saved to: ${zipPath}`);