Inserting images/videos into Expandable Content Section

[otterspace]

I have a paid theme, Showcase by Clean Canvas. I want to add individual images/videos to a row in an expandable content section. 

This will be for a FAQ/Troubleshooting page. I want the images to be inside an individual row so they are only seen when the plus sign is selected for that row. Is someone able to help guide me on how to do this?

Thank you!