AWS S3 Upload image to Bucket iOS app

I've posted a response to your forum thread here, but to summarize, I believe you've bumped up against a bug in the SDK and will need to explicitly set the S3 endpoint where your bucket is located.

Just wanted to weigh in, here is a code snippet that i got working

// #import <AWSS3/AWSS3.h>
// #import <AWSRuntime/AWSRuntime.h>
// then you should implement <AmazonServiceRequestDelegate>
// import those in your .h file and
// add the awss3 and awsruntime framework from the client
// download from Amazon
// myFace is the UIImage object

    AmazonS3Client *s3Client = [[AmazonS3Client alloc] initWithAccessKey:@"Key_Goes_here" withSecretKey:@"Secret_Goes_Here"];

    NSString *imageName = [NSString stringWithFormat:@"%@.png", @"cpa"];

    S3PutObjectRequest *objReq = [[S3PutObjectRequest alloc] initWithKey:imageName inBucket:@"bucket_name"];
    objReq.contentType = @"image/png";
    objReq.cannedACL   = [S3CannedACL publicRead];
    objReq.data = UIImagePNGRepresentation(myFace);
    objReq.delegate = self;

    [s3Client putObject:objReq];

here are the delegate methods:

-(void)request:(AmazonServiceRequest *)request didSendData:(long long)bytesWritten totalBytesWritten:(long long)totalBytesWritten totalBytesExpectedToWrite:(long long)totalBytesExpectedToWrite {
}

-(void)request:(AmazonServiceRequest *)request didReceiveResponse:(NSURLResponse *)response {
    NSLog(@"response! %@", response);
}

-(void)request:(AmazonServiceRequest *)request didCompleteWithResponse:(AmazonServiceResponse *)response {

}

-(void)request:(AmazonServiceRequest *)request didReceiveData:(NSData *)data {
    NSLog(@"data?");
}

-(void)request:(AmazonServiceRequest *)request didFailWithError:(NSError *)error {
    [self showAlertMessage:[error.userInfo objectForKey:@"message"] withTitle:@"Upload Error"];
}