Since version 1.0.4, WP Ultimo offered a convenient way to present your potential clients with thumbnails of your selected template sites. It automatically generates these thumbnails every 5 days, to reflect any eventual change you make to those template sites.
To learn how to select thumbnails read our Getting Started with Site Templates article.
Manually triggering the automatic Thumbnail Generator
To trigger the automatic thumbnail generator, just visit WP Ultimo settings page. The button to trigger that action is located in the Network Settings tab, alongside the other template options.
Note: The button will only be shown if the Allow Template Selection option is checked.