When you use our packs in Unity will be brought in as individual "clips" Inside of the editor you can make all kinds of changes to these clips such as selecting a specific frame range you want to use, change the play speed, set loop and blend points and set the orientation/scale of the clip. You can then use all of the clips to be played at different times and controlled by the game engine through code, state machines etc.
Looping animation clips
Masking animation clips
Additive animation on imported animation clips
Triggering events on animated clips.
This feature can be used for things like particle effects or sound effects that would be trigger during an animation and allows to have them be set a specific moments in an animations frame range.