curl --request POST \
  --url https://open.bigmodel.cn/api/llm-application/open/v2/application/file_upload \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form 'app_id=<string>' \
  --form files=@example-file

{
  "data": {
    "success_info": [
      {
        "file_id": "<string>",
        "file_name": "<string>"
      }
    ],
    "fail_info": [
      {
        "file_name": "<string>",
        "fail_reason": "<string>"
      }
    ]
  },
  "code": 123,
  "message": "<string>",
  "timestamp": 123
}