Unfortunately, it seems the image resizer cannot create resized animated GIFs.
However, if you update to very latest version (X3.23.0 two days ago), the image should work when viewing at large size. It would look like this:
http://flashlight.nitecore.com/render/w ... 0_En15.gif
After update, it will also pass through the original image when using "w1280-q90". As long as the image does not resize down, it will display the original animated GIF.