When accessing images in the gun screen (Gun Images section) holding down the ALT key will allow access to the native browser right click menu for images.
This allows access to the Open image in new Tab, Save image as... and Copy image options. Copy image can be used to add images into an email (you also can send emails with images directly from the system) or to add an image into another software like PowerPoint.
Standard Right Click Menu
ALT Right Click Menu