curl --request POST \
  --url https://api.agentset.ai/v1/namespace/{namespaceId}/uploads \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "fileName": "document.pdf",
  "contentType": "application/pdf",
  "fileSize": 1024
}'

{
  "success": true,
  "data": {
    "url": "<string>",
    "key": "<string>"
  }
}