Amazfit Watch faces

I am very interested to mix 2 gifs into one watchface one as intro : https://amazfitwatchfaces.com/mi-band-4/view/6291
And the other one as it gets into the screen with watch itself: https://amazfitwatchfaces.com/mi-band-4/view/9677
I don't know if its even possible and if it is idk how to format ...

Would someone help me out i spent 3 hours making an watchface that is 455kb and it wont make bin file out of it. How do I make it smaller?