Rated 3 out of 5 stars

Prior to 9.0.5 the attachment function was much more comfortable. Chosing the individual files is an (for the user) unnessecary additional step...

This review is for a previous version of the add-on (9.0.5). 

I agree... This change was (unfortunately) necessary, because of the stricter file access security model for a "Pure" MailExtension.