Hi @Sam.B,
Welcome to the Docusign Community!
We are glad to have you here and can't wait to help share as much knowledge as possible.
I am sorry to hear that you haven’t been able to download the customized CSV file for your template, but I will assist you in solving the issue. In my personal experience there might be cases in which the CSV file might not populate the right column headers right away. In these scenarios I have been able to successfully download the CSV file by removing the template from the envelope and re-adding it, afterward the CSV downloaded did contain the right column headers.
Feel free to let us know if you need further assistance with this. Thank you for using Docusign, we hope you have a wonderful rest of your day!
Best regards,
Alejandro R. | Docusign Community Moderator
Please click "Best Answer" below if you find my reply to be a valid solution to your issue!