[Plugin: WP-ImageFlow2] how works orderby

There is a description of the orderby parameter here: https://codex.www.ads-software.com/Function_Reference/query_posts#Orderby_Parameters

The WP-Imageflow2 gallery will follow the orderby specified for galleries from the WordPress media library (ie – images attached to the post or selected by media tags).

Whatever is valid for the “gallery” shortcode will work. An example would be
[wp-imageflow2 orderby='title' order='asc']