Sub-Workflow to the Main Workflow "Main - Check Folder every 5 Minutes"
https://forum.knime.com/t/question-about-wait-node/82041/8?u=mlauber71
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In order to get a Workflow Service Input / Output other than the table connection you have to:
drag the connection of the type you want from the previous node
until a transparent plus sign appears
then you search for the "Workflow Service Output"
when you click this it will change the type from table to the type you were just dragging along ....
THX to Linh for this insight ...