To add a CSV file to your Stacks page with Grid Iron 3, you must first add the Grid Iron 3 stack to your page and then simply drag and drop your CSV file into your Resources in the left panel of RapidWeaver.

In Grid Iron 3s settings, select CSV from the Type dropdown, then click on Set Link and locate your file under Resources.

Please remember that you will NOT be able to see your specific table until the site is published and online. The Preview feature will only represent the test table for formatting options.