If all you want to do is display a different icon when a category is unread, you could also use this plugin of mine which adds a UI for that: https://open.vanillaforums.com/addon/categoryunreadphoto-… (View Post)

As far as linking attachments to posts goes, the new standard way would be to parse the post when it is saved or updated for attachments by implementing Vanilla\Contracts\FormattingFormatInterFace::p… (View Post)

I'll look into it once I update all plugins for the next version. However if both categories have the same CSS-class, it's most likely one of the various bugs affecting read/unread categories. This p… (View Post)

Try renaming class.UnsetModules.php to class.UnsetModulesPlugin.php (View Post)

addon.json (View Post)