1.)
Now select both of the feet, legs, or shoes. Depending
on your character, once you selected them Convert
to Symbol.
Now choose Movie Clip, and name your characters symbol
legs. Click ok.
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2.)
Then insert
keyframe on 3 and add a regular frame.
Move the characters feet or legs opposite to how they
were originally.
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3.)
Publish
your animation and now you got a character doing a complete
animation.