Whenever I add animations onto the Endless Runner template on Construct, it makes my character move glitchy. Is there anyway to prevent this?
<Kinda noob at Construct>
Not sure what your problem is. I've built a game out of the endless runner example. Can you post a capx?
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Make sure to check that the collision box for each frame has continuity.
The best would be to add the animation as a separate sprite, pinned to the invisible sprite that has the Platformer behavior.
Refer to this tutorial on how to make a platform game as these points are treated in it.