Since I upgraded to WordPress 6.1.1 the option to upload featured images in my posts and pages disappeared. I cannot edit the existing ones and I cannot upload new images. Usually it was an option in the right side panel.
In my Theme I activated featured images like this (functions.php):
if (!function_exists('ksv_setup')) {
function ksv_setup() {
add_theme_support('post-thumbnails');
}
}
add_action('after_setup_theme', 'ksv_setup');
What can I do?