payload-upload-cover

{
  "id": "xxxxx",
  "book": {
    "bucket": "original",
    "path": "publication/book/file",
    "fileName": "xxxxx",
    "fileSize": 1200
  },
  "cover": {
    "urlFile": "http://namafile.pgn",
    "bucket": "original",
    "path": "publication/book/file",
    "fileName": "xxxxx",
    "fileSize": 1700
  }
}