Not attach, meaning no action possible at all. Also, in your screenshot for the plugin, there are additional actions possible – viz ‘Delete Attachments’ based on checkboxes, again this doesn’t show up for the plugin when installed.
When we try to upload a file, all we get is ‘Insert into Post’ on the Media Gallery Upload Lightbox. Obviously ‘Insert into Post’ would insert the image into the post, but will not show as part of the Media Gallery Inline Meta Box. After a refresh on the browser, of the Post that you’re currently editing, the images that were inserted into post will show up on the Media Gallery Inline Meta Box.
