How Presto accesses spreadsheets determines whether the data from the spreadsheet is a simple snapshot or is dynamic.

If the spreadsheet is located on your computer or on a network drive, Presto takes a snapshot of the data when you register the spreadsheet. Updates to your spreadsheet are not automatically visible in Presto. You must re-register the spreadsheet to update the data in Presto in this case.

If the spreadsheet is hosted in a content management system, such as SharePoint, or is simply accessible with a URL using HTTP, Presto links to the spreadsheet rather than copying data. Each time users use the spreadsheet mashable in Presto, Presto retrieves the current data from the spreadsheet dynamically.