我已經查看了有關此問題的幾個問題和答案，但是仍然無法上傳到S3存儲桶。我已經在應用程序標記中的清單中聲明了該服務。每個日志語句都返回正確的信息，但是狀態始終為WAITING，并且不會觸發任何傳輸偵聽器。我沒有收到任何錯誤，并且S3存儲桶仍然為空。我究竟做錯了什么？public void uploadStoredItems() {    TransferUtility transferUtility = TransferUtility.builder()            .context(AWSProvider.getInstance().getContext())            .awsConfiguration(AWSProvider.getInstance().getConfiguration())            .s3Client(new AmazonS3Client(AWSProvider.getInstance().getIdentityManager().getCredentialsProvider()))            .build();    try {        for (File csvFile : csvFiles) {            String filename = csvFile.getName(); //.substring(csvFile.getName().lastIndexOf('/') + 1);            Log.d(TAG, "This is the filename for upload: " + filename);            // FileReader reads text files in the default encoding.            String line = null;            FileReader fileReader = new FileReader(csvFile);            // Always wrap FileReader in BufferedReader.            BufferedReader bufferedReader = new BufferedReader(fileReader);            while ((line = bufferedReader.readLine()) != null) {                Log.d(TAG, "Here are the lines: " + line);            }            // Always close files.            bufferedReader.close();            TransferObserver uploadObserver = transferUtility.upload(filename, csvFile);            // Gets id of the transfer.            Log.d(TAG, "This is the bucket: " + uploadObserver.getBucket());            Log.d(TAG, "This is the state: " + uploadObserver.getState());            Log.d(TAG, "This is the id: " + uploadObserver.getId());