Files can also be sent while chatting. See chatting with contacts
1. Click on the Contacts
button to open the Contacts
tab. You should see all your connected contacts. If you do not see any contacts then you need to add some contacts first by sending them files using the New Message
2. Move your mouse over a contact to activate the action bar.
3. If the contact is online then the Chat button will be active. Click it to open the chat Window.