Log In to the URL https://admin.convoso.com/login using your Admin credentials.
From the Dashboard, click on “Call Apps” and select “FTP Push” from the drop down.
In Manage FTP Pushes, select the push that you want to edit click on the "Action Button" and click on “Edit”.
In General Tab, scroll down to (A) File Name Field and select the "File Name Format you wanted. Here are the options
Scroll down to the bottom of the page and click on "Apply Changes"