If you want to add new metabox under Dowloads --> Add New, you can use this hook.
One argument is passed to this hooks.
To add new metaboxes to wpdmpro post type.
add_filter('wpdm_meta_box','my_meta_box',10,1);
<?php
add_filter('wpdm_meta_box','my_meta_box',10,1);
function my_meta_box($metaboxs){
$meta_box['title'] = 'My Meta Box Title';
$meta_box['callback'] = 'my_call_back_function';
$meta_box['position'] = 'metabox positon';
$meta_box['priority'] = 'metabox priority';
$metaboxs['my_meta_box_id'] = $meta_box;
return $metaboxs;
}
?>
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