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@arresteddown" name="arresteddown_clip" />
<Anim dict="anim@arrestedleft" name="arrestedleft_clip" />
<Anim dict="anim@arrestedright" name="arrestedright_clip" />
<Anim dict="anim@arrestedup" name="arrestedup_clip" />
<Anim dict="anim@arrestedstand" name="arrestedstand_clip" />
<Anim dict="anim@arrestedstandlef" name="arrestedstandlef_clip" />


