While emailing bulk invoices through "Send Forms " option the attached files for the respective invoice is not getting attached along with the invoice. 

If emailing customers from the invoice using "email invoice with attachment", the email has the invoice along with the attached files. Also, I noted the attached files are not shown in the list, there are available in the TXN folder though.

I want to email all customers all the invoices along with the attached files using "Send Forms". Email Later option is already selected. Can someone help solve this.