Hmmm ... when I make an anim, I make a frame, then another on top of that, then another on top of that ... so having the first frame on top does not seem logical to me.
However, if it was good enough for Walt Disney, who am I to complain?
Now, about that reverse button ... that is a long-time request and not just a frivolrous extra - sometimes one makes an animation by starting at the end and working backwards ...
Bookmarks