No, a folder isn't data. It is metadata about an arrangement of files and does not itself include the data contained within the files. In some systems, folders are files, but they contain only the address and other data, telling you where to go for the actual data files or subfolders. Sending a folder would be like sending the index page from a book, rather than the book itself. You must either send the individual files, or zip up the folder and send the resulting zip file. File compression tools such as zip allow complete folder systems to be preserved, though you may have to explicitly set an option, often labelled "keep folder names" or similar.