For ResultFlow hosted blogs (aka, Instablogs) and self hosted "Superblogs" created prior to 4-May-2021, you need to update your Quick Featured Images Pro plugin. Please follow the instruction to update your plugin.
For Instablogs and Superblogs created starting 4-May-2021, plugin is already updated and no longer require the license key.
To automatically assign images to your blog posts, go to Featured Images → Default Images.
If Rule number 4 does not exist, click Add rule.
Click Choose random images.
Click on the image to select. You can hold down control key to select multiple images. Then click Choose random images.
In Taxonomy, choose Category. In Value, choose Summary.
Click Save Changes.
