Smarty.net php - Tweaks to skadate/oxwall mailbox

we are using skadate which is based on [login to view URL] template engine. We have it so messages cost user credits. but for some reason attachments sent are not costing credits as well. so we need you to look at the plugin and fix whatever line needs the adjustment to make attachments cost credits. we do have a few more task so if your able to finish this you will get a rehire right away. type n8 in your quote so I know you read everything.