Unable to fetch data from parent form to child form

Hello Community, I want to do a medical survey for a remote tribal people. The form will consist of A baseline survey form, registration form and different follow up A , B , C forms. I want to assign an unique ID for the person and it should fetch the data from the baseline form with all the information that has been given at the time of Registration to follow up A then the at the time of Follow up B the unique id should fetch the data to Follow up B which was filled in Follow up A form and so on. I have attached and gone through the dynamic data attachments page still not able to fetch data. Any help in fixing the forms would be appreciated

register.xlsx (13.1 KB)
follow-up.xlsx (12.6 KB)

Welcome back to the community, @ccras! You should be able to learn more about the dynamic data attachment (and troubleshoot your issue) through this support article:

i have gone through the steps provided but i am still unable to fetch the data. It’ll be nice if support can help me pointing out what am i doing wrong.