The Media Player source emulates an internal video server to playback videos directly onto the Timeline of a Show File.
Drag and drop a video into the Video Files directory of your workspace, or right-click > new to browse your computer:
Once you have created a Media-Player source, you can add a Video-Track into the Show Sequencer and drag and drop your media into it:
Drag & drop from Video Files to the Video Source track
Once a video is played back onto the timeline, it will be visible for all outputs which are assigned to this video source:
Video wall material