There too many parameters of this shorcode. You can find detailed instructions on the documentation file. Here are some examples;
Auto thumbnail, lightbox, left align
[auto_thumb width=»300″ height=»100″ link=»» lightbox=»» align=»left» title=»» alt=»» iframe=»»]
https://ajk.no/wp-content/uploads/2011/10/portrait-of-an-executive-working-on-computer-and-wearing-headpho.jpg
[/auto_thumb]
[show_shortcode]
[auto_thumb width=»300″ height=»100″ link=»» lightbox=»» align=»left» title=»» alt=»» iframe=»»]
full path of your image
[/auto_thumb]
[/show_shortcode]
Auto thumbnail, link to a video, lightbox, right align
[auto_thumb width=»300″ height=»100″ link=»http://vimeo.com/8245346″ lightbox=»» align=»right» title=»» alt=»» iframe=»»]
https://ajk.no/wp-content/uploads/2011/10/portrait-of-an-executive-working-on-computer-and-wearing-headpho.jpg
[/auto_thumb]
[show_shortcode]
[auto_thumb width=»300″ height=»100″ link=»http://vimeo.com/8245346″ lightbox=»» align=»right» title=»» alt=»» iframe=»»]
full path of your image
[/auto_thumb]
[/show_shortcode]
Auto thumbnail, link to an external url, lightbox, center align
[auto_thumb width=»300″ height=»100″ link=»http://google.com» lightbox=»» align=»center» title=»» alt=»» iframe=»true»]
https://ajk.no/wp-content/uploads/2011/10/portrait-of-an-executive-working-on-computer-and-wearing-headpho.jpg
[/auto_thumb]
[show_shortcode]
[auto_thumb width=»300″ height=»100″ link=»http://google.com» lightbox=»» align=»center» title=»» alt=»» iframe=»true»]
full path of your image
[/auto_thumb]
[/show_shortcode]