What a dataset is
A dataset is a table your Gmail templates read from: type a small one by hand, import a TXT or CSV file or connect Google Sheets, then edit it in the browser.
A dataset is a table your templates can read from. You can type a small one by hand, import it from a TXT or CSV file, or connect a table from Google Sheets.
Edit a dataset
Right-click the dataset in the pane and choose Edit in Browser.
Tip
In a simple dataset you can drag columns to reorder them. The key column always stays first.