Update mode values overlap previous data?

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- **What you're trying to do:**
I want to update values in google sheets but I don't know if it overlap the previous data or I have to clear all the spreadsheet and then update.
- **What code you've already tried**
I'm using this [documentation](https://developers.google.com/sheets/api/reference/rest/v4/spreadsheets.values/update).

No repository file or test is named. Start with the linked Google Sheets spreadsheets.values.update documentation and clarify the expected behavior for updating existing values; done would be a reproducible report with code, expected results, and a confirmed answer or actionable defect.

Scritto dal modello di indicizzazione a partire dal testo della issue.