1.Enable Debug

in your wp-config.php you will find a line that reads (most likely) like this:
define('WP_DEBUG', false);

REPLACE this with (or if it does not exist simply add the below)

define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);
define('WP_DEBUG_DISPLAY', false);/*this should NEVER be true for production sites*/

Note: this MUST be before /* That's all, stop editing! Happy blogging. */

Which will generate a file “wp-content/debug.log” if and when any errors are encountered.
Check this file for errors if you need to find out where things might go wrong

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documentor id 7