Assuming you have "customanims" by _Jennie_ here is the file location to drag and drop the YCD files.

mods\update\x64\dlcpacks\customanims\dlc.rpf\x64\anim\ingame\clip_mp_.rpf


And the to put in FavouriteAnims.XML
<Anim dict="anim@secretcar" name="secretcar_clip" />
<Anim dict="anim@secretleft" name="secretleft_clip" />
<Anim dict="anim@secretright" name="secretright_clip" />
<Anim dict="anim@secretwalkone" name="secretwalkone_clip" />
<Anim dict="anim@secretwalktwo" name="secretwalktwo_clip" />
<Anim dict="anim@secretrunone" name="secretrunone_clip" />
<Anim dict="anim@secretruntwo" name="secretruntwo_clip" />
<Anim dict="anim@secretrunthr" name="secretrunthr_clip" />
<Anim dict="anim@secretrunfr" name="secretrunfr_clip" />