Upload a File

You can upload a file to the current folder you are in by dragging a file from your desktop or local folder into the file list, wait until you see the Green "+ Add file" indicator.

You can also upload to the current folder using the Upload button located at the top of the file list.

To add a file to a folder that is a subfolder of your current location you can drag a file directly onto the folder. Notice the folder will turn green to indicate you are dragging into a folder:

Related:

Use phone camera as scanner
Files