Its literally as simple as going on FCS and clicking on races to bring up the list of races, searching up the name of the race from your mod that needs animations added to it, click on the little bar next to add in the menu that pops up once you click on the name of the race twice, select "animations" and it will bring up a list of animation packages you have (download this mod and then copy it from your steam local files into the kenshi folder labelled "mod" and you're good to go editing the mod, just don't name the mod with capital letters or it wont show up in FCS if its named exactly the same as the steam mod and no you don't need to delete the steam downloaded version just don't have it active on your mod list and use the kenshi mod folder version). Then you select the animation package which will likely be named after the animation mod of your choice (MCA is listed as MCA_animation from what I remember) and then click add and save your ♥♥♥♥ and you're done! You have working animations for almost any modded race you want, but you might want to seek help on custom races that have heavily modified bodies and request a modder for help on that patch.