Use the TransferUtility class also you will want to set the endpoint to https://nyc3.digitaloceanspaces.com

NSData *dataToUpload = // The data to upload.

AWSS3TransferUtilityUploadExpression *expression = [AWSS3TransferUtilityUploadExpression new];
expression.uploadProgress = ^(AWSS3TransferUtilityTask *task, int64_t bytesSent, int64_t totalBytesSent, int64_t totalBytesExpectedToSend) {
    dispatch_async(dispatch_get_main_queue(), ^{
        // Do something e.g. Update a progress bar.
    });
};

AWSS3TransferUtilityUploadCompletionHandlerBlock completionHandler = ^(AWSS3TransferUtilityUploadTask *task, NSError *error) {
    dispatch_async(dispatch_get_main_queue(), ^{
        // Do something e.g. Alert a user for transfer completion.
        // On failed uploads, `error` contains the error object.
    });
};

AWSS3TransferUtility *transferUtility = [AWSS3TransferUtility defaultS3TransferUtility];
[[transferUtility uploadFile:fileURL
                      bucket:@"YourBucketName"
                         key:@"YourObjectKeyName"
                 contentType:@"text/plain" 
                  expression:expression
            completionHander:completionHandler] continueWithBlock:^id(AWSTask *task) {
    if (task.error) {
        NSLog(@"Error: %@", task.error);
    }
    if (task.exception) {
        NSLog(@"Exception: %@", task.exception);
    }
    if (task.result) {
        AWSS3TransferUtilityUploadTask *uploadTask = task.result;
        // Do something with uploadTask.
    }

    return nil;
}];

is it work ? i try my ios it does not work

my AppDelegate

   func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

        registerForPushNotifications()

        NetworkignService.shared.checkInternetStatus()

        UIApplication.shared.statusBarStyle = .lightContent

        FBSDKApplicationDelegate.sharedInstance().application(application,
                                                              didFinishLaunchingWithOptions: launchOptions)

        LocationManager.determineCurrentLocation()


        let endpoint = AWSEndpoint(urlString: "https://sgp1.digitaloceanspaces.com")



        let credentialsProvider = AWSStaticCredentialsProvider(
            accessKey:"XN6NS55KIE5OD6PNYC7R",
            secretKey: "LpHUnBsx6MtFsHn59jmUGKt9KCUjqU6+jPY8jG150iE/gBB8"
        )

        let defaultServiceConfiguration = AWSServiceConfiguration(
            region: AWSRegionType.APSoutheast1,
            endpoint: endpoint,
            credentialsProvider: credentialsProvider
        )

        defaultServiceConfiguration?.maxRetryCount = 5
        defaultServiceConfiguration?.timeoutIntervalForRequest = 10
        AWSServiceManager.default().defaultServiceConfiguration = defaultServiceConfiguration

        return true
    }

    @IBAction func uploadImageToAWS(_ sender: Any) {
        if profileImage.image == nil {
            // Do something to wake up user :)
        } else {
            let image = profileImage.image!
            let fileManager = FileManager.default
            let path = (NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as NSString).appendingPathComponent("test3.jpeg")
            let imageData = UIImageJPEGRepresentation(image, 0)
            fileManager.createFile(atPath: path as String, contents: imageData, attributes: nil)

            let fileUrl = NSURL(fileURLWithPath: path)
            let uploadRequest = AWSS3TransferManagerUploadRequest()
            uploadRequest?.bucket = "adda"
            uploadRequest?.key = "test"
            uploadRequest?.contentType = "image/jpeg"
            uploadRequest?.body = (fileUrl as URL?)!
            uploadRequest?.serverSideEncryption = AWSS3ServerSideEncryption.awsKms
            uploadRequest?.uploadProgress = { (bytesSent, totalBytesSent, totalBytesExpectedToSend) -> Void in
                DispatchQueue.main.async(execute: {
                    //                    print("totalBytesSent",totalBytesSent)
                    //                    print("totalBytesExpectedToSend",totalBytesExpectedToSend)

                    //                    self.amountUploaded = totalBytesSent // To show the updating data status in label.
                    //                    self.fileSize = totalBytesExpectedToSend
                })
            }

            let transferManager = AWSS3TransferManager.default()
            transferManager.upload(uploadRequest!).continueWith(executor: AWSExecutor.mainThread(), block: { (task:AWSTask<AnyObject>) -> Any? in
                if task.error != nil {
                    // Error.
                    print("error", task.error?.localizedDescription)
                } else {
                    // Do something with your result.
                    print("No error Upload Done")
                }
                return nil
            })
        }

Eorror

listObjects failed: [Error Domain=com.amazonaws.AWSServiceErrorDomain Code=3 "(null)" UserInfo={Code=SignatureDoesNotMatch, HostId=1af6c2-sgp1a-sgp, RequestId=tx00000000000000036e4b9-005b596ddb-1af6c2-sgp1a}]

error Optional("The operation couldn’t be completed. (com.amazonaws.AWSServiceErrorDomain error 3.)")```


This XML file does not appear to have any style information associated with it. The document tree is shown below.
<ListBucketResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
<Name>addaapi</Name>
<Prefix/>
<Marker/>
<MaxKeys>1000</MaxKeys>
<IsTruncated>false</IsTruncated>
</ListBucketResult>