zulip/zerver/webhooks/slack_incoming/fixtures/attachment_pieces.json

{
  "attachments": [
    {
      "title": "Test",
      "image_url": "https://pbs.twimg.com/profile_images/625633822235693056/lNGUneLX_400x400.jpg",
      "ts": 1655945306
    }
  ]
}