Send data in SFTP with GSM Shield2

Hello :slight_smile: ,

I've a problem to send data in sftp from SD to my site.
I'm using these boards: Arduino Mega 2560, Arduino SD Shield and Arduino GSM Shield2.

I've found in forum and other sites some examples for ftp data transfer but this isn't good for my project.
Moreover I read Quectel's AT Commands Manual but, following their examples, I could not solve the problem.

Can anyone give me an help please?

Can anyone give me an help please?