Skip to content

How to

Add next month, and your dashboard follows

When next month's file arrives, add it to the same dataset. Every step reruns, and the dashboard built on it picks up the new month: totals, charts and filters. Adding data by hand works on Free.

38 seconds, real app, made-up orders. The dashboard stays a draft; nothing is published. Follow along with the same two: Orders, July to September (CSV) and Orders, October (CSV). Download the video (MP4)

The steps

  1. 1

    Start from your dashboard

    Here, a revenue dashboard built on July to September: 240 orders and 157.4k in revenue.

    Before: total revenue 157.4k, 240 orders, 867 units sold
  2. 2

    Open the dataset behind it

    In Data, select the dataset the dashboard is built on. Its panel says which dashboards it feeds.

  3. 3

    Add next month's file

    Choose Add data and upload the new file. Leave the update method on Add to existing data so the earlier months stay. Choose Submit. The dataset now has 325 rows, in 2 batches, and any steps on it run on the new rows too.

    The Add data dialog for orders_2026-q3.csv: upload file, update method Add to existing data, orders_2026-10.csv chosen
  4. 4

    Open the dashboard

    Nothing to rebuild. The totals include October: 325 orders and 191.0k. The Order date filter now runs to 31 October, and the headline and key insights are updated. Check one total against your files.

    After: 325 records, total revenue 191.0k, 325 orders, 1.1k units sold, and the headline South carries the most revenue, at 59.0k

What carries over

When you add data to a dataset:

  • Every step on the dataset runs again, on old and new rows
  • Dashboards built on it show the new rows when you open them
  • Each upload is kept as its own batch in Settings & history

On Free you add each month by hand, and up to 3 dashboards stay live for your viewers. Paid plans can pick up new files from a folder or refresh on a schedule.

If it doesn’t look right

The new month isn't on the dashboard
Check the file went into the dataset the dashboard is built on: its panel says which dashboards it feeds. Then check the row count went up.
The totals doubled
You probably uploaded a file that repeats earlier months. Open Settings & history on the dataset and check the batches. Rows in a suspended batch don't count on dashboards, so suspend the duplicate one.
The columns changed this month
If the new file's columns don't match, Mammoth asks before adding it, so you can match them up.

Share it

When the board is right, share it. Viewers are free on every plan.
Sharing dashboards in the docs

Try it with next month's file.

Open the dataset, choose Add data, then check a total on the dashboard.

  • ✓ 14-day Pro trial
  • ✓ No credit card
  • ✓ Viewers always free