You uploaded an APK or Android App Bundle which has an activity, activity alias, service or broadcast receiver with intent filter, but without 'android:exported' property set. This file can't be installed on Android 12 or higher

Development Platform & Builds Mobile
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Inside MyGame.Build.cs

public MyGame(ReadOnlyTargetRules Target) : base(Target)
	{
		PCHUsage = PCHUsageMode.UseExplicitOrSharedPCHs;
	
		PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore" });

		PrivateDependencyModuleNames.AddRange(new string[] {  });

        // Uncomment if you are using Slate UI
        // PrivateDependencyModuleNames.AddRange(new string[] { "Slate", "SlateCore" });
        PrivateDependencyModuleNames.AddRange(new string[] { "OnlineSubsystem", "OnlineSubsystemUtils" });

        DynamicallyLoadedModuleNames.Add("OnlineSubsystemNull");

        if (Target.Platform == UnrealTargetPlatform.IOS)
        {
            PrivateDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine"});
            DynamicallyLoadedModuleNames.Add("IOSAdvertising");
        }
        else if (Target.Platform == UnrealTargetPlatform.Android)
        {
            PrivateDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine"});
            DynamicallyLoadedModuleNames.Add("AndroidAdvertising");
            // Add UPL to add configrules.txt to our APK
            string PluginPath = Utils.MakePathRelativeTo(ModuleDirectory, Target.RelativeEnginePath);
            AdditionalPropertiesForReceipt.Add("AndroidPlugin", System.IO.Path.Combine(PluginPath, "AddAndroidExportedToSplash_UPL.xml"));

        }
    }

Inside MyGame/Source/MyGame folder, you need this file:AddAndroidExportedToSplash_UPL.xml

<?xml version="1.0" encoding="utf-8"?>
<root xmlns:android="http://schemas.android.com/apk/res/android">
	<!-- init section is always evaluated once per architecture -->
	<init>
	</init>

	<!-- optional updates applied to AndroidManifest.xml -->
	<androidManifestUpdates>
		<!-- update the SplashActivity activity -->
		<loopElements tag="activity">
			<setStringFromAttribute result="activityName" tag="$" name="android:name"/>
			<setBoolIsEqual result="bSplashActivity" arg1="$S(activityName)" arg2="com.epicgames.ue4.SplashActivity"/>
			<if condition="bSplashActivity">
				<true>
					<addAttribute tag="$" name="android:exported" value="true"/>
				</true>
			</if>
		</loopElements>
	</androidManifestUpdates>
</root>
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