解析PFFile保存错误

Question

我有一个使用Parse API +服务器的应用。我最近将它迁移到了AWS服务器和MongoDB。迁移之后，我发现PFFiles无法保存到服务器，大于800 KB左右。我基本上使用图像选择器从用户那里获取图像，然后以下面的方式保存它。

$scope.selectedOption = "A";
$scope.lastSelectedOption = "A";
$scope.handleSelection = function(){
console.log("Selected Item: "+$scope.selectedOption);
console.log("Last Selected Item:" + $scope.lastSelectedOption);
console.log("");
$scope.lastSelectedOption = $scope.selectedOption;
}`

以下是我得到的错误说明 -

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    UIImage *pickedImage = [info objectForKey:UIImagePickerControllerOriginalImage];    


    [self dismissViewControllerAnimated:YES completion:^{

        NSError *fileError;
        NSData *imageData = UIImageJPEGRepresentation(_selectedImage, .9);
        PFFile *imageFile = [PFFile fileWithName:@"pimg.jpg" data:imageData contentType:@"image/jpeg" error:&fileError];
        if(fileError) {
            [Utilities popUpMessage:@"file error"];
        }

        [imageFile saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {

            if(!error) {
                //SUCCESS

            } else {
                NSLog(@"Error: %@",error.debugDescription);
                //FAILURE
            }

        }];

    }];
}

感谢任何帮助。