Unable to see Featured Image

Unfortunately, our current version doesn’t store images as featured images. But, this is already on our TODO lists. So, we will have this very soon.

As a quick solution, we have prepared a patch for you. Kindly try adding the following code to the bottom of your theme’s functions.php file.

function aiovg_custom_init() {
    add_post_type_support( 'aiovg_videos', 'thumbnail' );
}
add_action( 'init', 'aiovg_custom_init', 11 );

// Works on OLD posts
function aiovg_set_featured_images() {
    if ( false == get_option( 'aiovg_featured_images_inserted' ) ) {
        add_option( 'aiovg_featured_images_inserted', 1 );

        $items = get_posts( array( 'post_type' => 'aiovg_videos', 'post_status' => 'any', 'numberposts' => -1, 'fields' => 'ids' ) );
           
        if ( count( $items ) ) {
            foreach ( $items as $item ) {
                $image_id = get_post_meta( $item->ID, 'image_id', true );
                if ( (int) $image_id > 0 ) {
                    set_post_thumbnail( $item->ID, $image_id );
                }              
            }
        }
    }
}
add_action( 'init', 'aiovg_set_featured_images' );

// Works on NEW posts
function aiovg_custom_save_featured_image( $post_id, $post ) {  
    if ( ! isset( $_POST['post_type'] ) ) {
        return $post_id;
    }

    // Check this is the "aiovg_videos" custom post type
    if ( 'aiovg_videos' != $post->post_type ) {
        return $post_id;
    }
   
    // If this is an autosave, our form has not been submitted, so we don't want to do anything
    if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
        return $post_id;
    }

    // Check if "aiovg_video_sources_nonce" nonce is set
    if ( isset( $_POST['aiovg_video_sources_nonce'] ) ) {      
        // Verify that the nonce is valid
        if ( wp_verify_nonce( $_POST['aiovg_video_sources_nonce'], 'aiovg_save_video_sources' ) ) {
            $image_id = get_post_meta( $post_id, 'image_id', true );
            if ( (int) $image_id > 0 ) {
                set_post_thumbnail( $post_id, $image_id );
            }
        }
    }

    return $post_id;
}
add_action( 'save_post', 'aiovg_custom_save_featured_image', 99, 2 );

Hope this solved your issue!