How come writeToFile does not write over original file? - ios

Question

I am saving a file like this in my iOS App in my UIImagePickerDelegate's method didFinishPIckingMediaWithInfo:
// write
NSString* filePath = [NSHomeDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:#"Documents/invoice.jpeg"]];
NSData *imageData = UIImageJPEGRepresentation(info[UIImagePickerControllerOriginalImage], 0.0);
if (imageData != nil) {
[imageData writeToFile:filePath atomically:YES];
}
Then I am retrieving the file like this:
// load
NSString *searchFilename = #"invoice.jpeg";
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSDirectoryEnumerator *direnum = [[NSFileManager defaultManager] enumeratorAtPath:documentsDirectory];
NSString *documentsSubpath;
while (documentsSubpath = [direnum nextObject])
{
if (![documentsSubpath.lastPathComponent isEqual:searchFilename]) {
continue;
}
NSURL *fileURL = [[NSURL alloc]initFileURLWithPath:[NSString stringWithFormat:#"%#/%#",documentsDirectory,documentsSubpath]];
[self.imageContentView setupImageViewerWithImageURL:fileURL onOpen:^{
NSLog(#"open %#",fileURL);
} onClose:^{
NSLog(#"close %#",fileURL);
}];
}
The files do get loaded properly. However, when I update the photo (imageData) in my UIImagePickerDelegate and try to reload the image, I still get the original image written into my app documents.