Cover images (or thumbnails) are an easy way to show a preview of what's inside a category in the Resources section. It also makes your Resources section more visibly appealing and easier to navigate.
Here's how cover images works:
First, the tool will automatically select the first image file in your overall category to show as the cover image. If there is no image file found, it will display a generic icon.
You can also customize the cover image by uploading your own. Here's how to do it:
1. Click the category you want to edit
2. Click the pencil icon (edit)
3. One of the options displayed will be to upload a cover image. Click that button, select your image, then click publish.