Hello there! Ofcourse happy to help :) Hmm the first thing i think of is maybe the last cel didnt have the effect applied to it before tweening? Another thing to check is to make sure its not compleatly empty as it wont have any keyframe to tween to.
Is there any chance youd be able to upload a small screen capture so I can see what is happening?


























Oh dang I had worked on this same idea a while back but never released it xD Seems ya beat me too it! Nicely done :D Great minds think alike I suppose 😆 