Creating a gif image using photoshop

1: Upload the images to Photoshop.

 To upload images into Photoshop, click File > Scripts > Load Files Into Stack.

Then, select Browse, and choose which files you'd like to use in your GIF. Then, click OK.

2: Open up the Timeline window.

To open Timeline, go to the top navigation, choose Window > Timeline. The Timeline will let you turn different layers on and off for different periods of time.

3: In the Timeline window, click 'Create Frame Animation.'

If it's not automatically selected, choose it from the drop-down menu.

4: Create a new layer for each new frame.

To do this, first select all your layers by going to the top navigation menu and choosing Select > All Layers. Then, click the menu icon on the right of the Timeline screen.
From the drop-down menu that appears, choose Create new layer for each new frame.

5: Open the same menu icon on the right, and choose 'Make Frames From Layers.'

This will make each layer a frame of your GIF.

6: Under each frame, select how long it should appear for before switching to the next frame.

To do this, click the time below each frame and choose how long you'd like it to appear.

7: At the bottom of the toolbar, select how many times you'd like it to loop.

The default will say Once, but you can loop it as many times as you want as needed.

8: Export created GIF

Save the GIF image by going to the top navigation bar and clicking File > Export > Save for Web (Legacy)...