In boomi,Why is there only one flat file record at the end of the "New" path in the document?

Instructions

Reurn to Edit Mode.

To resolve the Set Properties shape error, set the Disk File Name property to the static value Installed.csv

Run the process in Test Mode using the Test Atom Cloud. $-$ The 'New' status records are combined into a single outbound file by the Data Process shape,Set Properties uses the same outbound file name for the 'New' status records and sets the Disk Operation to Append if the file already exists,The 'Contact File$-$ New' map automatically combines all documents with the 'New' status,One of the Contact records contains several Descriptions