Dummy/garbage text is required in the "Write to file or database" field to be able to write files from fullpaths using the "Take File Table name from field" check box and dropdown (also horrible UX/UI IMO). Without which you get a uninformative "Cannot access the folder" error message.
This isn't obvious and makes no sense and should not be required. The User experience here is very unintuitive, can you review this component?