[otrs] StorageModule problem

Dear All, My OTRS is 2.4.3 on CentOS 5.2, the Ticket::StorageModule setting: ArticleStorageFS. My problem is ： when agent want to forward a ticket with attachment, but the mail didn't show that attchment. I'v checked var/article and found the attachment had been saved in related folder. At the same time, no related record in database table "article_attachment". Any one can help to fix it? Thx a lot！ -- Hpsbigcat