You can add arrow icons to your design to simply and easily control your gallery image advancement, to help you provide your viewers with a great user experience on your site!

First, you will need to add icons to your canvas to control your gallery images with. 

With your icons added to the canvas containing your gallery, we now need to set the proper click actions. First, let's look at how to set the action for the "next" arrow.
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The click action should be set up as shown below.
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Now let's look at how to determine what gallery should be chosen for your "target" field.
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Lastly, we apply the same click action to the "previous" arrow. 

There you have it, now your gallery images are advanced by clicking the arrow icons!