animated

One animated GIF: a 5 second looping clip of 42 KB. Animated GIFs are a special case for many systems. A thumbnail generator may keep only the first frame, a resizer may break the animation, and a size limit that suits a still image may reject a short loop. Use this file to check what your upload does with moving images: whether it plays in the browser, whether it keeps animating after being resized, and whether the first frame is used as a preview. Compare it with the animated WebP and APNG versions of the same idea.