Why is settransferlistener not triggered in AWS?

I'm trying to upload photos from Android to S3, and the latest operation method I follow on the S3 website is tutorial, but it doesn't seem to trigger transferobserver. All my variables are declared globally. When I run this Code:

               credentialsProvider = new CognitoCachingCredentialsProvider(
                        getApplicationContext(),
                        "us-east-SECRET", // Identity Pool ID
                        Regions.US_EAST_1 // Region
                );

                    // Instantiate an S3 Client
                    // Create an S3 client
                    s3 = new AmazonS3Client(credentialsProvider);

                    // Set the region of your s3 bucket
                    s3.setRegion(Region.getRegion(Regions.DEFAULT_REGION));

                    // Instantiate TransferUtility
                    transferUtility = new TransferUtility(s3, getApplicationContext());

                    //Upload a file to amazon s3
                    Log.i("imageFile", imageFile.toString());

                    observer = transferUtility.upload(
                            "foond",     /* The bucket to upload to */
                            "key",    /* The key for the uploaded object */
                            imageFile        /* The file where the data to upload exists */
                    );

                    Log.i("observer", observer.getAbsoluteFilePath());
                    Log.i("observer", observer.toString());
                    Log.i("observer", observer.getState().toString());
                    Log.i("observer", String.valueOf(observer.getBytesTransferred()));

                    observer.setTransferListener(new TransferListener() {
                        @Override
                        public void onStateChanged(int id, TransferState state) {
                            Log.i("id", String.valueOf(id));
                            Log.i("TransferState", String.valueOf(state));
                        }

                        @Override
                        public void onProgressChanged(int id, long bytesCurrent, long bytesTotal) {
                            Log.i("id", String.valueOf(id));
                            Log.i("bytesCurrent", String.valueOf(bytesCurrent));
                            Log.i("bytesTotal", String.valueOf(bytesTotal));
                        }

                        @Override
                        public void one rror(int id, Exception ex) {
                            Log.e("Error", String.valueOf(ex));
                        }
                    });

                    Log.i("observer", observer.getState().toString());
                    Log.i("observer", String.valueOf(observer.getBytesTransferred()));

What I get in the console is

I/OpenGLRenderer: Initialized EGL, version 1.4
W/art: Suspending all threads took: 21.244ms
D/CognitoCachingCredentialsProvider: Loading credentials from SharedPreferences
I/imageFile: /storage/emulated/0/DCIM/Camera/IMG_20160223_134442.jpg
V/RenderScript: 0x9ab29000 Launching thread(s), cpus 4
I/Observer: /storage/emulated/0/DCIM/Camera/IMG_20160223_134442.jpg
I/Observer: com.amazonaws.mobileconnectors.s3.transferutility.TransferObserver@6e1c6df
W/art: Suspending all threads took: 9.843ms
I/Observer: WAITING
I/Observer: 0
I/Observer: WAITING
I/Observer: 0

In my opinion, no logs are printed in settransferlistener. Why is this? In addition, it should be noted that the image is not uploaded to S3

This is my permission on the list

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

This is the dependency I imported:

compile 'com.amazonaws:aws-android-sdk-core:2.+'
compile 'com.amazonaws:aws-android-sdk-cognito:2.+'
compile 'com.amazonaws:aws-android-sdk-s3:2.+'
compile 'com.amazonaws:aws-android-sdk-ddb:2.+'

I know that my settings for S3 and cognito are correct because I use the sample code provided in GitHub and have a file to upload. The problem is that the code is not suitable for the Android version I run in Android studio, and I don't want to experience the trouble of degrading the version

This is my configuration in gradle

compileSdkVersion 23
buildToolsVersion "23.0.2"

defaultConfig {
    applicationId "xxxxxxxxx"
    minSdkVersion 15
    targetSdkVersion 23
    versionCode 1
    versionName "1.0"
}

TL; Dr: transferobserver = transferutility.upload does not work properly. And the image has not been uploaded

resolvent:

Just indicate (refer to services) in the list

<service
    android:name="com.amazonaws.mobileconnectors.s3.transferutility.TransferService"
    android:enabled="true" />