PART 2

Add Key Fames
Right-click anywhere between the first frame and last frame and Create Motion Tween.
Add a keyframe to the last frame.
Right click on last frame and Insert Keyframe OR Click on last frame + F6.
By now the jagged line on the layer would have transformed into a long smooth arrow.



Click on the last frame, and drag the image for the distance of half its width to the left.



Loop the Image
The final step is the most crucial part. In this step the image is looped so that it runs continuously.

Right click on last frame > Properties > Click on Action tab , the + sign, Go To





Click on Go to and Play, and make sure the values for Scene and Frame are <current scene> and Number 1 respectively.
Click on OK.