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Opening the cumulative file text-files.txt in a text editor after transfer has been completed will show the order in which content of all five individual files were added to the cumulative file.
Note that this will not necessarily follow the order in which transfer of individual files was started.
Setting the CumulativeFileDelete parameter to false and running the transfer operation a number of times will show the that the setting allows the ongoing addition of content to the CumulativeFile - a procedure that is commonly used, for example, for log files.