Use the Animation Window in Photoshop to Successively Turn the Visibility of Each Layer On, Then Off.

Now that each frame in our animation has been loaded as a separate layer in one Photoshop image, we can use the Animation window to successively turn each frame on, then off.

1) Select "Window" -> "Animation"

The Animation window will keep track of each frame of your animation.

2) Turn off the visibility of every layer except for the bottom layer.

The "Eyeball" signals visibility. Click to turn on/off.

3) Enable visibility for exactly one layer per frame of your animation.

Only layer1 is visible for frame1.

 4) Add as many new frames as you need.

Only layer2 is visible for frame2.

Only layer3 is visible for frame3.

Only layer12 is visible for frame12.

5) Select frame12, hold down "SHIFT" and select frame1. Every frame should be selected.

Selected frames are highlighted in blue. 

6) Select a pause time for each frame of the animation.

This animation will show frames per second (fps).

7) Enjoy the show!

A Horse in Motion.

 Step 6: How to save your animated Gif!