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// Add this in 'middleware' key under config.json
"multipart": { 
  "enabled": true,
  "priority": 80,
  "module": {
    "name": "kraken-js/middleware/multipart",
    "arguments": [{
      "keepExtensions": true,
      "uploadDir": "path:./you/want/to/place"
    }]
  }
}