The gallery does not show up, there is no error message

In case you are completely missing a JIG instance, it is often because the scripts are not loaded on the page. JIG inserts all of its scripts, both inline and .js files into the footer. But your theme might not support this if it doesn't use best practices.

1. With an FTP client, navigate to your theme's folder on your WordPress installation. It should be like /wp-content/themes/Avada/
2. Download and open footer.php in a text editor.
3. Look for this code:
   
   <?php wp_footer(); ?>

   1	<?php wp_footer(); ?>

   It should be near the end of the file. If it's not there, add it just before this:
   
   </body>

   1

   </body>

4. Save and upload back to your server, overwriting the original. Make a backup if you are unsure.

If the code was there, or this didn't solve your problem, look into other related fixes.

Are you using CloudFlare? Ensure that Rocket Loader™ is disabled!