Can I upload gif image in slides/banners?

Yes, you can upload gif images to the banners/ sliders. When you have your store hosted on the StoreHippo platform, you have the liberty to design the look and feel of your store. 

To know how to add images/gifs in banners and sliders, refer the following links:
https://help.storehippo.com/topic/slides
https://help.storehippo.com/topic/banners