To send a folder with multiple files in it, create a .zip file from the folder before uploading it. This way you’ll be able to upload folders, or sets of folders, and save the structure of the files inside them. It will also allow you to preserve the name of the folders, because you get to name the .zip file.
On a Mac, Right-click the folder that needs zipping and choosing “compress …your folders name”.
For Windows, Right-click the file or folder, point to Send to, and then click Compressed (zipped) folder.
A new compressed folder is created in the same location. To rename it, right-click the folder, click Rename, and then type the new name.