curl --request POST \
  --url https://api.ai2fin.com/api/chat/upload \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data'

{
  "success": true,
  "data": {
    "files": [
      {
        "assetUrl": "<string>",
        "fileName": "<string>",
        "mimeType": "<string>",
        "size": 123
      }
    ]
  }
}