Both Unity Player and Adobe Flash Player are required for the Secure Mail image viewer. Neither plugin is mandatory for the sending and receiving of messages.
To download the latest versions of both Unity Player and Adobe Flash Player please follow the links below:
Unity Player – Required to view 3D STL files:
Adobe Flash Player – Required to view and annotate photos and X-Rays:
Downloading these browser plugins will allow you to view and annotate images and view STL files within Secure Mail