Attaching extra animations to character.

Hi guys,
So I am completely new to unity, I'm currently working on a project that involves a purchased character pack that contains characters already set up with rigs, animations, collisions, prefabs etc.
Now, the characters are using the animations from the mecanim tutorial, seen here: https://www.youtube.com/watch?v=Xx21y9eJq1U

I have then taken the characters out, rigged and then created some extra animations we need for our game.
However, when I try to attach them to the characters, they just go into a "squatting" position and do not work.
I then also tried using the mesh and rig that they use (the tall, tutorial guy), created a super simple animation to test it, and that equally does not work either.

Is what I am trying to do possible?
If you need more information, I will give it straight away.

Thanks!

 

Great! thank you so much! Turns out all I was missing was setting my animation type to humanoid, and making it into an avatar.

You've alleviated a gargantuan headache, thank you!