Is the issue that you're having, is that it just "SNAPS" to the direction without interpolating? Because unreal pawns do that by default and its pretty annoying. Ha! I'm not in front of unreal at the moment but off the top of my head there are three setting that you almost always have to set before you can start working…
(moved from 3D Art Showcase to Technical Talk) Good luck extracting the models. A quick search seems to indicate there are tools to query character models here https://www.rdr2mods.com/downloads/rdr2/tools/45-openiv/