EventIDE can load and render static .gif images only, the gif animation is not supported. You can still load animated gif files in Material Library but they will be rendered as static images made of the first frame of animation.
Possible solution is that you convert a gif animation into a movie file (e.g. with the EZGIF online converter) and then load the converted movie into EventIDE. One of the advantages is that you can then adjust the animation speed, if you use move with Frame Sequencer element.