We reported when USCIS launched Freedom of Information Act (FOIA) Immigration Records SysTem (FIRST), which allows FOIA requestors to submit, manage, and receive FOIA requests entirely online. As part of phase one, after submission of request by mail, fax, or email, users / FOIA requestors were only able to login to their account and download their documents. 

A USCIS press release indicates that they are currently working on phase two. When fully implemented, FIRST will allow online submission, online case management, and digital delivery for all USCIS FOIA requests. This digital delivery process is expected to save time, improve efficiency, and eliminate potential errors that can occur with manually issuing a CD. Until this new system is fully operational, requestors must continue filing their FOIA requests through the current process (by mail, fax, or email).

This USCIS update can be found here.