WP File Manager – Codex Doc

apply_filters(‘fileupload_from_email’)

Change From Email 

• Notification when file uploaded by user

Example:

add_filter('fileupload_from_email', 'change_from_email');
function change_from_email($dedault_email){
return 'any@otheremail.com';
}

add_filter(‘fileupload_subject’)

Change Subject

• Notification when file uploaded by user

Example:

add_filter('fileupload_subject', 'change_subject', 10, 2);
function change_subject($dedault_subject, $file_name){

	return 'A new file ' . $file_name . ' is uploaded ';
}

add_filter(‘fileupload_receivers’)

Change Recipients

• Notification when file uploaded by user
• Receivers – Array

Example:

add_filter('fileupload_receivers', 'change_receivers');
function change_receivers($dedault_receivers){

	$dedault_receivers[] = 'new@email.com';
	return $dedault_receivers;
}

add_filter(‘fileupload_message’)

Change Email Message (Body) 

• Notification when file uploaded by user
• $file_data – Array with following keys
• title
• filename
• file_meta (key, value)

Example:

add_filter('fileupload_message', 'change_message', 10, 2);
function change_message($message, $args){

	$file_meta = '';
	if($args){
		foreach($args['file_meta'] as $key => $val){
			$file_meta .= $key .': '.$val.'
';
		}
	$message .= '
' . $file_meta;
	}

	return $message;
}