Stream while simultaneously downloading video from URL using video player

Hi, I'm wanting to use a video clip as the background in my menu scene for one of my games.

Setting the video player's URL to the URL I want to play works, however, each time the game is launched, it re-downloads the video. This causes unnecessary data usage, especially on mobile.

Instead, I tried downloading the video using a UnityWebRequest and saving it to a file. This works, and the video only has to be downloaded once, however, the video then needs to be fully downloaded before playback can commence, meaning there is a delay before the video starts playing.

So, my question is: is there any way to stream a video from a URL directly using the video player, but also cache the download in the persistent data path, so the video is only downloaded once?

The only other way I can think of achieving this is by playing the video via the URL of the video player, while also downloading the file using a web request. This is better than downloading it every time the game is launched, however, it still downloads the video twice which is not ideal.

Thanks.