Get upload URL

{
  "status": "success",
  "data": {
    "uploadURL": "http://example.com/upload",
    "fileName": "example.jpg",
    "fileType": "image/jpeg",
    "fileSize": 12345,
    "originalFileName": "original.jpg",
    "createdAt": 1633024800000,
    "expiresAt": 1654560800000
  }
}