iOS oss上传文件成功，但是在后台不显示

iOS oss上传文件成功，但是在后台不显示，是什么原因，上传代码如下:

NSString *endpoint = @"http://oss-cn-hangzhou.aliyuncs.com";

id<OSSCredentialProvider> credential = [[OSSPlainTextAKSKPairCredentialProvider alloc] initWithPlainTextAccessKey:kAccessKey secretKey:kSecretKey];

OSSClientConfiguration * conf = [OSSClientConfiguration new];
conf.maxRetryCount = 3; // 网络请求遇到异常失败后的重试次数
conf.timeoutIntervalForRequest = 30; // 网络请求的超时时间
conf.timeoutIntervalForResource = 24 * 60 * 60; // 允许资源传输的最长时间
OSSClient *client = [[OSSClient alloc] initWithEndpoint:endpoint credentialProvider:credential clientConfiguration:conf];
OSSPutObjectRequest *put = [OSSPutObjectRequest new];
put.bucketName = kBucketName;
put.objectKey = [NSString stringWithFormat:@"USERS/USER1/%@/setting.txt", self.frameID];
put.uploadingFileURL = [NSURL fileURLWithPath:filePath];;
// optional fields
put.uploadProgress = ^(int64_t bytesSent, int64_t totalByteSent, int64_t totalBytesExpectedToSend) {
    NSLog(@"%lld, %lld, %lld", bytesSent, totalByteSent, totalBytesExpectedToSend);
};
OSSTask *putTask = [client putObject:put];
[putTask continueWithBlock:^id _Nullable(OSSTask * _Nonnull task) {
    if (!task.error) {
        GFFLog(@"上传成功");
    }else{
        GFFLog(@"上传失败:%@", task.error);
    }
    return nil;
}];