Open Animation Shop

Click on Animation Wizard
 

next

next

next

Add Your Images

I highlighted them all at once.

Re-line in order if needed

Finish

CTRL A to select all.

Right click and set the time for your frames.
I have the finished frame set to about 400.

Click on Animation, Reverse Frames.
So the flower grows correctly.

Here are my frames

And the finished tag.