WordPress allows queries of tags. Tags apply to posts, and also to custom posts or attachments that have this feature enabled, the shortcode generator does not generate codes for the settings listed in theWordPress Codex, but they are supported by the plugin. Array values should be entered as comma delimited values.
When tags are enabled, they will be displayed in the taxonomy section of the advanced query tab.
The following two queries will produce the identical result:
[featured_image_pro post_tag_terms='198' post_tag_field='id' posts_per_page=999 taxonomies='post_tag']
Is the same as
[featured_image_pro tag__in='198' posts_per_page=999]