The current File application does not support uploading of folders directly. The folder must first be created in the filing cabinet and then have the files uploaded into that folder
Step 1: Click on the Files Icon
Step 2: Click on the New Folder button toward the upper-right corner of screen
Step 3: Type in the name of the folder
Step 4: Browse to within the folder by double-clicking the folder
Step 5: Click the Upload button and select the files to upload