Problem with Video Loading Screen

[Arsalan]

Hello guys, i wanted to make Loading Screen with video background (local video) for my server. at the start i use [Release] Standalone - Simple, but nice looking loadscreen and i change the code on index.html line 62 to 73 from `

<style>
	body {
		background-image: url('background.jpg');
		background-repeat: no-repeat;
		background-attachment: fixed;
		background-size: cover;
	}
</style>

to this

< video autoplay muted loop id="myVideo"> < source src="rain.mp4" type="video/mp4"> Your browser does not support HTML5 video. < /video>

and when i try to browse it with browser it works fine, i have the loading screen with background, but when i use it on server the whole HTML page load but background is Black and not loading
i also try to create a simple HTML page like this https://www.w3schools.com/howto/tryit.asp?filename=tryhow_css_fullscreen_video
and it works on browser but still black background on loadscreen server.
i add the files to resource too

files {
    'index.html',
    'vid.mp4'
}

loadscreen 'index.html'

it would be greate if someone could help me. thanks