We want to create an automated mail campaign that has 1st mail and 3 follow-ups and this is clear and straightforward using zoho automation campaign.

We have following requirement:

First mail should contain quotation for customer and flw-up mail would serve as reminders for payment.

Our problem is that we can't find a way to enroll a customer in sequence and change the attachment for each customer (each customer should receive a different quotation). From our understanding, campaigns work in a way that you link campaigns with a list and add customers to that list . But we need the option to edit the attachment within the sequence  before the mail is sent to the customer.