Both the Workbook and Excel version of Append Range do not have an option to add headers if they are not present and it’s going to append to the first row. To get around this, I am having to check whether the file exists to know whether to do a write range (which has the option) or use the append range, defeating the point of the fact that append range can create a file if it is not present.
I would ask that the Append Range activities be updated to include options to add headers when writing data to files.