return fmt.Errorf("Invalid according to Policy: Policy Condition failed: [%s, %s, %s]", op, policy.Key, policy.Value)
			}
		}
		delete(mustFindInPolicy, formCanonicalName)
	}

	// For SignV2 - Signature/AWSAccessKeyId fields do not need to be in the policy
	if _, ok := formValues[xhttp.AmzSignatureV2]; ok {
		delete(mustFindInPolicy, xhttp.AmzSignatureV2)
		for k := range mustFindInPolicy {