To add this section to your custom page just click the Cover option underneath the Add Section heading.
To add an image to your cover in this section, click the Add Cover button, this will open your computers native file library system so that you can navigate to the file that you want to upload to use on your custom page section.
The attachment file types that you can add are: .jpg, .jpeg, and .png
Once done, click the save button in the top right to confirm the addition of your images to the slider on your custom page.
Here’s how it can look with a cover added to your custom page.