My suspicion is that it packs the Movie into a .Pak file. How to not include packaging Movie in a .Pak file considering that I am using Project Launcher to make a Shipping build (because default packaging will still package a Development build even if you chose Shipping) and Project Launcher ignores the “Specific Movies to Copy” in Project Settings. I am on 5.6.
Or maybe the problem is something else? Btw I am using Async Loading Screen plugin for loading and when I do a Development build (not via Project Launcher) I have a Startup Movie without a problem