UIPboardboard inserts a retina-free image into a keyboard extension

Question

I use UIPastboard to copy and paste a retina image into a keyboard extension, but when pasted into notes or messages, it appears as an image without a retina.

Below is my code that copies the image to cardboard.

        UIImage *retinaImage = [UIImage imageNamed:@"retinaimage.png"];
        NSData *imageData = UIImagePNGRepresentation(retinaImage);
        [[UIPasteboard generalPasteboard] setData:imageData forPasteboardType:@"public.png"];