[
  {
    "message": "Hello world!",
    "attachments": []
  },
  {
    "message": "This is an example message with an attachment",
    "attachments": ["https://example.com/image.jpg"]
  },
  {
    "message": "Another training message",
    "attachments": []
  },
  {
    "message": "Messages can have multiple attachments",
    "attachments": [
      "https://example.com/image1.jpg",
      "https://example.com/image2.jpg"
    ]
  }
]