Many of my customers use the support email instead of the portal to enter tickets. When this happens, the "Description" field is left blank. The email subject is automatically entered as the ticket subject when tickets are created this way - I would like the body of the original email to go into the ticket description in the same way.

A similar ticket is here: Converting email body as Ticket Description (zoho.com)

I followed the suggested automation from the ticket here: Automation #7 - Auto-update Email Content to a Ticket (zoho.com)

However, when creating the rule, in the Actions section, I do not have an option for "Custom Functions" to input the provided script. 

Is there any adjustments to the automation needed for the latest versions of ZOHO Desk, or is there any other way to achieve what I'd like?