413 Payload Too Large on Web Messaging File Upload API

  • Genesys Cloud API v2
  • Node.js 18
  • Postman Collection: Web Messaging
  • Region: US EAST
HTTP/1.1 413 Payload Too Large
Content-Type: application/json
{"message":"The request body size exceeds the maximum allowed size."}

Sending a 5.2MB PDF via POST /api/v2/conversations/messaging/files fails immediately. The docs imply a 10MB limit, but my pre-request script sets Content-Type: multipart/form-data. Is there a hidden server-side restriction for specific MIME types like application/pdf in the guest API context?