preview.php

 <?php
 
 
 * --------------------------------------------------------------------
 *  CUSTOM CONFIG VALUES
 * --------------------------------------------------------------------

// enable file sync for previews
$assign_to_config['stash_file_sync'] = TRUE;

// apply a prefix to all saved variables, so we don't overwrite any cached vars used by live site when previewing
$assign_to_config['stash_var_prefix'] = 'preview-';