MessagesFileUploadDto

{
    "shorturl": {
        "mode": "unique",
        "url": "https://www.google.com/"
    },
    "external_id": "123456789-client",
    "scheduleAt": "2019-08-24T14:15:22Z",
    "content": "Hello World",
    "sender": "SENDER",
    "file": "string"
}