问腾讯云上传图片失败，code = 400，烦请帮忙看下是什么原因？

上传失败:Error Domain=com.tencent.qcloud.networking Code=400 "(null)" UserInfo={__name=Error, RequestId=NWVkMTA1ODBfNjljMDBiMDlfMmQ0ZDFfMzdjNzk0Yg==, Code=InvalidRequest, TraceId=OGVmYzZiMmQzYjA2OWNhODk0NTRkMTBiOWVmMDAxODczNTBmNjMwZmQ0MTZkMjg0NjlkNTYyNmY4ZTRkZTk0N2FiMmYwMTY2MDExNTVkYjZlZjEyOTBjYTg3YWFkMTczZTM1ZDZiZDg1M2FiMjgwNDZiNzlmNWU4MTBiODdlMTA=, __QCloudUploadResumeDataKey__={length = 705, bytes = 0x7b22626f 6479223a 7b226f72 6967696e ... 67657222 3a7b7d7d }, Resource=venus-1259350874-.cos.ap-beijing.myqcloud.com/venus/B35B0EA1-C4E0-4907-96F9-7CAC491D7969, Message=Missing required header for this request: Appid, Bucket format should be <bucketname>-<appid>}