Using Deluge To Merge and Download Document and Attach to Deal

I have a custom function that currently lives inside Zoho CRM and is triggered via a workflow rule. The custom function takes information from a deal and creates a merged document (zoho writer functionality), and then attaches that merged document to the deal. In an effort to save our workflow rules limit, I wanted to migrate this custom function to "Zoho Flow." Unfortunately, when I create a custom function and copy and paste the code into the custom function in Zoho Flow, I get an error saying "zohowriter connection doesnot exists at line number 1. Resolve the errors and try again"

My "zohowriter" connection was created in Zoho CRM. I don't know if I have to create a different connection for Zoho Flow. Would greatly appreciate it if someone could help me figure out what I need to change for this to work through Zoho Flow.

For reference, I used this for instructions on the custom function and it DOES work if you do it from CRM:

https://www.zoho.com/writer/help/automate-writer-mail-merge-actions-with-crm-workflow.html

Here is the full code:

void testmvk(int potid, string xxxxx)

{

potinfo = zoho.crm.getRecordById("Deals",potid);

fields = zoho.writer.getMergeFields(xxxxx,"zohowriter").get("fields").distinct();

val = Collection();

for each rec in fields

{

field = ifnull(potinfo.get(rec),"");

if(field.contains("{") && field.contains("id"))