如何将filepicker url文件作为附件发送电子邮件？

I am working with file-picker. from front-end side user is filling a form and uploading files in it, which are stored using file-picker. on submit of users form I have to send him acknowledgement email with his files as an attachment. files need to be send as attachment and not as file-picker url in body. I am using node js. Can anyone help me out?I am working with file-picker. from front-end s