30 documents or 30 chunks. Seems about the same.
If you want more information than just an image.
Create a snippet that get all documents in a container or folder.
name: getDocsArray
desc: make arrays from parent folders
<?php
$query_children = $modx->db->query('
SELECT cat.id,cat.pagetitle,cat.alias
FROM '.$modx->getFullTableName('site_content').' AS cat
WHERE
cat.parent = "'.$parentFolder.'"
ORDER BY
cat.pagetitle
');
$arr_categories = array();
while ($row = $modx->db->getRow($query_children)) {
$arr_categories[] = $row['pagetitle']."==".$row['id'];
}
$output = implode("||",$arr_categories);
return $output;
?>
For your TV in
Input Option Values:
use this (where 25 is the id of your parent folder)
@EVAL return $modx->runSnippet('getDocsArray',array('parentFolder'=>'25'));
Widget Delimited list
Delimiter ,
This will create a list of checkboxes for each document in the folder.