Works fine for me. Are you sure you saved it into the correct folder? img/animations in your project folder, not in the newdata folder where MV is installed.
Are you saying JUST the black parts don't show, or the entire image isn't in the list? If it's just the black parts, how did you add the image? If you used the resource manager you might have had some setting that masked that colour. I normally just save the resource right into the folder and bypass resource manager completely. Doing it that way, for me, the image itself AND the black parts show up.