Opening flower

In Flash 8 I have a series of vector files of a flower opening (blooming). But when I import a vector file (frame 1), position it and import the next vector file (frame 20), I cannot get the tween shape to work. of a five pedal flower, I am only importing a portion of one pedal. It shows the first frame then blank until the last. The time line is a series of dots not a solid line. What am I missing? I’m trying to achieve something like this |…/…__

thanks