Because Flywheel locks down the wp-config.php file (see this help doc), to turn on WP_DEBUG you simply enable it on the Advanced tab in the Flywheel control panel:
Doing so will set define( ‘WP_DEBUG’, true ); in the wp-config.php file. For more information about WP_DEBUG and its uses, check out the WordPress documentation about WP_DEBUG.
If you have any questions our Happiness Engineers are here to help!
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Managed Plugin Updates: Database upgrades
Managed Plugin Updates: Pause plugin updates
Managed Plugin Updates: Plugin Security Alerts