curl --request GET \
  --url https://api.moonshot.cn/v1/files/{file_id} \
  --header 'Authorization: Bearer <token>'

{
  "id": "<string>",
  "object": "file",
  "bytes": 123,
  "created_at": 123,
  "filename": "<string>",
  "purpose": "file-extract",
  "status": "ready",
  "status_details": "<string>"
}