Hello! I’m still trying to learn more about the Dynamic Data Attachment feature.
I followed the steps here. But when I tried to upload my child project, I encountered an error. It says: Unmatched begin statement: group (C_Demographic)
Welcome to the community, @sedsuringa! That could be a syntax issue. Seems like your begin group and the end group count does not match. Try making a count to see that they both match.
This has nothing to do with the dynamic attachment feature, it is a syntax error in your form: There is a end_group missing (unbalanced begin / end lines).
It is recommended, please, to always check your form with the Online validator, during development and before deployment.