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When creating a temporary file you won't have the option to choose an output as it is not creating a physical output as such. To activate the output path section you need to choose the "Choose Specific Output File" option on the dropdown, then browse to the file you are going to overwrite.
In this case, it might be worth loading in that file, appending the date, or other grouping factor, as a column, unioning the new stream with the new date, and then overwriting the original.