Hi,
I have a problem that's been bugging me for a while. I've just been working around it by adding another layer each time, but that's getting out of hand.

I noticed sometimes, after a tween, you can't change the instance of a graphic symbol (meaning you can't change the frame the graphic symbol is showing) after a tween, and sometimes you can.
The times when you can, there is a vertical line before the last keyframe of the tween, and when you can't, there isn't.

How do you change the instances of a graphic symbol after a tween?