When using the Site Library, you may see a message like this:
Having WP_DEBUG enabled during the import process may cause issues if the plugins being imported have any PHP notices or errors.
In order to ensure a smooth import process, it’s a good idea to set WP_DEBUG to false.
To do so, find your wp-config.php file in the root folder of your website via FTP or File Manager, and set WP_DEBUG to false. Save the file, then refresh the Site Library and proceed with your import.