This boolean value will enable (true) or disable (false) the generation of thumbnails when a file is uploaded.

Please note that this setting follows the thumbnail gd settings when determining what actions to perform etc.

Example of usage in the config.php file

$mcImageManagerConfig['upload.create_thumbnail'] = true; 

Example of usage in the Web.Config file

<add key="upload.create_thumbnail" value="true" />

Example of usage in a mc_access file