Hi, what do you mean for the "briefing" screen?
If you're asking about the plot & map screens which are showing before a level starting, then i was using the special tool. It's calling "CutSceneMaker". You may to download this tool from here: Vk.com
You should chose the right version of this tool according the version of RGM what you're using.
P.S. I don't actualy know how i can help you by other way.
NarayanGames
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