Seems doesn't work for local gif?

[Holton1]

Hi, this project is very cool! I am making a webpage and try to add the gif-operating feature to gifs. I notice that for the same GIF, if I upload it to imgur, gif-player works; but if I just use the local URL(relative URL or absolute URL), it doesn't work. I guess I have to do something with the URL, but I am not very sure. Could you please provide some hints? Thanks!