Using animations

Hey i have downloaded numerous models, and many come with cool, and unique animations, Such as a dreadnought i downloaded has a flamethrower alternate attack...only problem is I have NO idea how to use alternate animations for attacks. For example..I tried to make it so that whenever this dreadnought attacks it attacks with a flamethrower, didn't work. Please help I can't find any solutions anywhere on Google or anything.

You can use an orb-based ability, e.g. "Melee Fire Bonus Damage" and set Art - Animation names to the name of the animation. It most likely works.