The New Material Skin includes a login screen image/video rotator.
To add images and/or videos to the login screen, copy your images and videos in the "rotator" folder
"c:\Program Files (x86)\NETProjects\Gizmo Service\Skins\Material\Rotator"
The above folder is located on the PC running Gizmo Service
If the folder does not exit, create one and name it "Rotator"
To use image files/ videos located on a different folder or even a network share, you can edit the file "config.json" inside the skin folder