Everytime same video gets uploaded + Assets Library

Question

    ImgVidData =[[NSData alloc]init];

    ALAssetRepresentation *representation = alAsset.defaultRepresentation;
    NSURL *movieURL = representation.url;
    NSURL *uploadURL = [NSURL fileURLWithPath:[[NSTemporaryDirectory() stringByAppendingPathComponent:@"test"] stringByAppendingString:@".mov"]];

  //  ImgVidData = [NSData dataWithContentsOfFile: [[NSTemporaryDirectory() stringByAppendingPathComponent:@"test"] stringByAppendingString:@".mp4"]];

    AVAsset *asset      = [AVURLAsset URLAssetWithURL:movieURL options:nil];
    AVAssetExportSession *session =
    [AVAssetExportSession exportSessionWithAsset:asset presetName:AVAssetExportPresetMediumQuality];

    session.outputFileType  = AVFileTypeQuickTimeMovie;
    session.outputURL       = uploadURL;
    videoURL=uploadURL;
          [session exportAsynchronouslyWithCompletionHandler:^{

        if (session.status == AVAssetExportSessionStatusCompleted)
        {
            NSLog(@"output Video URL %@",uploadURL);

        }



    }];
    ImgVidData    = [NSData dataWithContentsOfURL:session.outputURL];

Above is the code , i have implemented inside didFinishPickingAssets:(NSArray *)assets

I'm picking up the video and uploading the video to server. I'm fetching uploaded video URL and converting it into NSdata and uploading it to server.

STRANGE : everytime I'm getting same video uploaded to server which i choose first time. i choose different video everytime but same videos get uplaoded. Any help !!