WP_CONTENT_URL and TinyMCE

  • We have defined the following in wp-config.php

    define('WP_CONTENT_DIR', '/var/www/vhosts/cdn.domain.com/wp-content');
define('WP_CONTENT_URL', 'https://cdn.domain.com/wp-content');

    We have also created a custom TinyMCE button

    add_filter('mce_external_plugins', array($this, 'add_tinymce_plugin'));
add_filter('mce_buttons', array($this, 'register_tinymce_button' ));

    The button is appearing but fails when clicked. According to console:

    Error: Permission denied to access property “tinymce”
    tinymce = tinyMCE = parentWin.tinymce;

    I believe this is happening because WordPress is being served from https://www.domain.com but the popup is being served from https://cdn.domain.com. It works perfectly without WP_CONTENT_URL and WP_CONTENT_DIR. Please advise.

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