I have nintex form developed for SP2013 On-Premise environment. I have to validate the Attachment based on below condition.
1. If user is from "ABC" Ad group then Attachment of any document is mandatory.
2. If user is not from "ABC" then allow user to save the item with out attachment. ( or not mandatory)
Kindly share your ideas how to resolve this issue in On-Premise Nintex 2013 .