The Read Text File component reads and outputs the contents of a file as plain text. Add it to a flow in the Flow Designer, in the Toolbox panel, by expanding the category Integration > File and dragging a Read Text File component to the workspace.
The Create Text File component saves a plain text file to the local file system. Add it to a flow in the Flow Designer. In the Toolbox panel, under the category Integration > File, drag a Create Text File component to the workspace.
The List Files in Directory component creates a list of filenames for a given directory. Create a flow to list the files in the Flow Designer. In the Toolbox panel, under the category Integration > File, drag a List Files in Directory component to the workspace.