This section displays the files that you have sent to other users or to the Cloud Storage area. In particular it’s highlighted for each file, the name and the status of the transfer. If it is at 100% that means the file was successfully sent.
With a simple double click on the line you can open the selected file in the Documents window. With a right click on the line of the file, however, the context menu appears and asks if you want to open or save the file.
PC & Mac: messages from server window - Sent files