Select the Resources tool from the Tool Menu of your site.
To the right of the folder you want to drag-and-drop files, from the Add drop-down menu, select Upload Files.
This displays the upload Files page.
Drag files from your computer and drop them in box marked "Drop files to upload".
This will display thumbnails of the files that will be uploaded.
This uploads the files.
The files are now located inside the selected Resources folder.
Sep 04, 2014