How to sent only attachment( not main payload) to receiver using SFTP Adapter

Hi Experts,

My scenario is form SOAP Proxy to SFTP. From SAP system We are getting the data( main payload and attachment)through proxy.

I have to sent only attachment data to receiver through SFTP. Please help me with the configuration steps in PI.

Do I need to check any parameters other than Store attachment in SFTP Receiver Channel.

Thanks,

Gayathri.