Did you know that you can easily load in multiple files without using multiple reader nodes. Simply use the List Files node to gather all the filenames together. Convert these into variables with a TableRow to Variable Loop Start node, connect the variable port to a file reader of your choice (right click to view variable ports). Now in the node, click on the Flow Variables tab, and next to the input category, choose the URL or Filenames variable from the dropdown. Finally complete this with a Loop End node.