How do I add multiple captions to a video?

1. Create a template with the layers / objects you wish to modify
2. Head to your project and click Create Video Template under Video Templates
3. Select the Template base you created and pick Multi Overlay from the drop-down menu
4. Click Save Video Template

You can now use this template to create a video with a slideshow overlay that may include multiple captions or images.

Check out the API Reference doc ↗ for more information on this.