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I can see the issue you described, when I try to edit a Content Template I see an error 504 Gateway Timeout. Usually this indicates one of the following problems:
- Your server has limited memory available for WordPress or the WP backend. You can try resolving that by adding to or adjusting the WP_MEMORY_LIMIT and WP_MAX_MEMORY_LIMIT values in your wp-config.php file. At a minimum, these two should be '128M', but since you have quite a few plugins and a custom theme installed I would recommend '256M' for each. Before you add this code, check your wp-config.php file to see if either of these is already included:
define('WP_MEMORY_LIMIT', '256M');
define( 'WP_MAX_MEMORY_LIMIT', '256M' );
If either is already defined to a higher number like '512M', leave it alone. If either is already defined to a lower number, increase that number to '256M' as shown above. If either is not defined, add the definition and set it to '256M' as shown above. Note that the M is required and must be included. In other words this is wrong, and must be corrected:
define('WP_MEMORY_LIMIT', '256');
define( 'WP_MAX_MEMORY_LIMIT', '512' );
Test again, then let me know the results.
- There is a conflict between Toolset and your theme, or a conflict between Toolset and a plugin you have active on the site, or a combination of conflicts. To pinpoint the problem, temporarily activate a default theme like Twenty Twenty, and deactivate all plugins except Types and Blocks. If you would like to activate a Maintenance Mode plugin while testing, that is fine. Activate only those 2 or 3 plugins, then test the Content Template editor again. If the problem is resolved when you deactivate other plugins and themes, reactivate your parent theme first and test, then activate your child theme and test, then other plugins, one-by-one, testing each time you active something new. Try to pinpoint just one component that is responsible for the return of the problem. If it is not possible for you to perform these tests, I can download a copy of the Foundry theme from your site by installing the WP Downloader plugin, and run the tests on my own local test environment.
Let me know what you find out and we can go from there. Thank you!
