The plugin can be used with pages, posts, images (attachment) and any custom post type. This option is not available in the widget. Please insure that your posts have images unless you are using the advanced features of the plugin.
The default post type is ‘post’.
Display product posts from Woo Commerce:
[featured_image_pro post_type='product' showcaptions=true showexcerpts=true excerptlength=5]
Display event posts from Events Manager using advanced options:
[featured_image_pro post_type='event' subcaptiontitle1='Event Date: ' subcaptioncast1='date' subcaptiontype1='meta' showcaptions=true subcaption1='_event_start_date' captionhr=true showexcerpts=true excerptlength=5]