Hello Buddy Bains,
Could you please make sure the following is well set?
When you publish the workbook, then the dialog should provide an option as to how you want to refresh it.
Selecting incremental denotes that the first time you extract it will be a full refresh, and each subsequent time will be based on the max date/time that you have chosen and it will import data starting with this max date.
We should be able to work from this.
Lénaïc RIÉDINGER, Global Community Engineer Tableau
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