Movie Player Loading Screen - No Widget/Movies

Hello !

I’m currently trying to make a Loading Screen with a plugin ( not the GameInstance), the thing is after the FLoadingScreenAttributes are made and the loading screen is set, nothing visual happens in the Game (in Standalone), the screens stays black for the MinimumLoadingScreenDisplayTime amount. The only thing that happens are the logs that show up and the MinimumLoadingScreenDisplayTime that is taken in account.

FLoadingScreenAttributes LoadingScreen;
	LoadingScreen.bAutoCompleteWhenLoadingCompletes = ScreenDesc.bAutoCompleteWhenLoadingCompletes;
	LoadingScreen.WidgetLoadingScreen = SNew(SLoadingScreenWidget, ScreenDesc);
	LoadingScreen.MinimumLoadingScreenDisplayTime = ScreenDesc.MinimumLoadingScreenDisplayTime;
	LoadingScreen.bMoviesAreSkippable = ScreenDesc.bMoviesAreSkippable;
	LoadingScreen.MoviePaths = ScreenDesc.MoviePaths;
	GetMoviePlayer()->SetupLoadingScreen(LoadingScreen);

	GEngine->AddOnScreenDebugMessage(-1, 15.0f, FColor::Yellow, TEXT("Loading Began"));

I saw the “GetMoviePlayer()->PlayMovie()” function but it’s only working for the test widget

The Construct function of the Slate Widget is also happening since its log shows up.

Does anyone have an idea of what’s causing this ? Last time i made a Loading Screen was in 4.12, did it changes in 4.13 ?

Thank you in advance !