Rest Sender Adapter PDF attachment handling

Hi Experts,
I have a requirement to receive PDF document and store in FTP from REST Service.
I have enabled the option in "Support Attachments" Rest Sender Communication Channel but I couldn't be able to see the attachment in the message monitoring.
Main request payload name : <blank>

Response message multipart type : multipart/mixed.

I am following the SAP Note: 2365727.

Let me know if I am missing anything.