It does not add them to the post if you want a list of all the attachments you can use this shortcode [wpba-attachment-list]
. If you want them added to the post in a different way you have to click the add media button and select/upload the file you want in the post then click insert into post. The primary use of the plugin is not to insert the attachments into posts since WordPress already has this functionality. However it does not have a good structure of dealing with files attached to posts which is what I am trying to solve. I like to use it mainly for building custom sliders without having to create custom post types or any other way but there are many other uses as well. Sorry for the confusion, if you have any more issues please let me know if not please mark as resolved, thanks.