POST /v1/uploads/presign

{
  "uploadId": "ul_abc123",
  "uploadUrl": "https://..."
}

PUT <uploadUrl>
Content-Type: application/octet-stream

<raw-file-bytes>

const docex = createDocex({ apiKey, baseUrl });

// The SDK handles presign + upload automatically:
const result = await docex.run({
  file: "./invoice.pdf",     // SDK reads file, presigns, uploads
  prompt: "Extract line items, totals, and vendor details",
});