Video Preview:

Let's make this very simple Media Gallery project together:

1. Create a new template.
2. Add an Interface Editor component.
   
3. Now click on Edit.
   
4. Add a Media Gallery, pressing the button.
   
5. Resize the media gallery at the "Position" tab.
   
6. At the "Layer" tab, let's add one or more video or image contents. Click "Files..."
   
7. I'll select two image files.
   
   
8. If your content has different resolution, select a proper scale type. I'll select Outfit, so it's bigger dimension fit the screen, and my visitor can't see the background, but preserving the it's aspect.
   
9. Looks good! Now I'll add the content CMS, to allow me to add more images in the future through the Campaing creator in my CMS platform.
   
10. I'll add a transition effect between images, so my Campign looks smoother. In this case, I chose the "Push out" effect.
    
11. Apply all changes, and now you can Playback to test it. 
    

Great job!

The example project is available for download in the link below. Feel free to edit it according to your project.