HELP!!!!! with 2008 horsey model

https://reddit.com/link/1usxges/video/hc0gjbptcgch1/player

i need help with this 2008 horse model!!!!!

ok ingame its moving (prob because of a glitch) but when i insert the model in studio it just stops

so my friend told that it might be because of some old car configurations, i went to retro studio and replicated the model and it wasnt moving!!!!!

me and my friends love these horses!!!!!!pls help reddit people