Lumo can draw the chart. You still need to define the number.

What Proton announced

Proton announced on August 3, 2026 that Lumo can create charts, graphs and other visuals directly in chat. The announcement describes visual responses to supplied datasets and follow-up requests that refine the output. It also says Lumo may choose to produce a visual when that would help explain a response.

This expands the possible output from a conversation. It does not establish that a generated chart has used the right unit, calculation or comparison. We have reviewed the announcement and related documentation, not benchmarked the feature or audited a generated workbook.

Sources: Proton

Define one row before one chart

Before uploading a file, describe what a row represents: an order, a customer, a support message or a monthly total. Then name the measure and the time window. This is our recommended preparation, not a product requirement.

For an illustrative customer report, a count of messages is not automatically a count of customers. Someone who contacted support three times can contribute three rows. Ask for the proposed counting rule in plain language before asking for the final graphic, especially when the file contains duplicates, missing values or several currencies.

Treat data handling as a separate decision

Proton accompanies its product with a published Lumo security-model explanation. That document is a separate part of evaluating whether the service is appropriate for a particular dataset. A visualization feature announcement alone cannot answer every question about permitted data use, retention or organizational policy.

For an initial exercise, use a small non-sensitive dataset whose totals you can calculate independently. That isolates the presentation question from the decision to share confidential information. If the tool fits the task, review the applicable data controls before broadening the inputs.

Sources: Proton

Keep the working behind the picture

Ask for the aggregation used, the excluded rows and the table behind the visual. These are suggested review requests; confirm what the product actually returns. Reconcile the total with the original file, and inspect labels, units and any truncated axis.

A chart can be an excellent working draft without being ready for a board deck. Keep the checked data and the final image together so the next person can understand the number. The feature is most useful when it shortens the route to an inspectable explanation, rather than making an unexplained result look finished.