So I recently got Photoshop CS4 and learned how to make gifs using this tutorial from someone I follow on Tumblr. It worked out well and I made an awesome looking gif of Orange Caramel. However, when I tried to upload it to Tumblr, It wouldn't upload. I know it's small enough and should be allowed to upload but it just won't.

Any ideas???

I'd be really grateful if someone could help me with this...

This is the gif I made: