Variable Substitution and PGP Encryption on SFTP Receiver?

Hi All,

I have a file to SFTP scenario that I am trying to use variable sub. on to pull a field out of the payload and place it in the filename. However, I also want to encrypt the file. This does not work because PI encrypts the file before using Variable Sub. Therefore is there a way to use both? If not, can you use variable sub. within the module tab?