I've never tried those, but they should work just as well!
That looks amazing! And personally, I'm a big fan of the material you picked.
I uploaded my gifs the same way that I did for all my pictures... I'm using a mac, as well, so if you're on a different type of computer it might be different. If the problem persists, you might try contacting Instructables or emailing an editor.
Calligraphy -- Quick and Ch...View Instructable »
Custom Guitar Case (DIY!)View Instructable »