The last part of the Post-Game notes configuration allows you to attach media.
Click Attach File.
This will open up a new media window:
Any media already loaded on your Catapult AMS platform will show. These may be attached by selecting the paperclip icon on the right hand side.
If you would like to attach new media select the Upload File button in the top right hand corner:
This will allow you to select remote files or add a YouTube clip:
Files you have attached can then be viewed or deleted via the Uploaded Media list.