My problem is similar to this one https://feedback.bistudio.com/T165276

function - proto native void MakeScreenshot ( string name ) in 1_Core/proto.c

My code:

modded class PlayerBase
{
	override void OnJumpStart()
	{
		super.OnJumpStart();
		MakeScreenshot("MyScreenshot");
	}
}

This code create empty folder in my profile folder on client side:
c:\Users\Nytlenc\AppData\Local\DayZ\ScreenShots
and create empty folder in $profile:ScreenShots on the server side in server folder

But both of these directories are empty. Screenshots are not generated.
If you delete the specified directories and call the function again, then the directories are created again and they are empty again.