Files should be sequentially numbered with zero-padded names, e.g. 01.webp, 02.webp, ... 36.webp or product_0001.png, product_0002.png, ... product_0016.png. All files must share the same naming pattern and extension.
01.webp, 02.webp, ... 36.webp
product_0001.png, product_0002.png, ... product_0016.png