Custom Models: Animations

Hey Guys,

Seasoned TS engineer here, but a n00b when it comes to game development,
Well with models and animations in particular,

Right now, we have some UABs in the public assets which are NPCs that come with baked in animations, am i right to assume.

Meta does not support allowing users to import custom models with their own animations, and if I wanted to do this,

I would need to import different meshes and then script them together.

If I am incorrect, please point me in the right direction,
Or if the above assumption is correct - does anyone know any streamlined workflows for a solo dev? I don't want to make crazy custom animated characters, just to have some unique models, so i am not stock with stock assets.

Thanks