From what I’ve learned, it’s a theme issue. Its something to do with a missing line of code in a PHP file: <?php echo do_shortcode( $textarea );?>
.
From the answer I got from my theme’s support forum (post here), all I had to do was to put the shortcode of the appbox plugin in a shortcode Gutengerg block: [appbox style storename app-id]
. And it worked!
@letmedo this might work for you.
Hope this can help others!