Upload files with Desktop app

I cannot see an option to upload a file or any option to download a specfic file using the Desktop app.    I have installed the app for Android and can both upload and download files.

The menu in the top right gives the options to Disconnect and Set Password.

Right-clicking on a folder gives the options to create a New Folder or Paste.

The menu for a file has the following options: Cut, Copy, Copy Link, Delete, Rename, Email and Open.

The version of the Desktop app is

The firmware on the EX2 is 1.05.25

After playing with the app for a bit I have discovered that I can drag and drop files from Windows Explorer