Issue sending video using twilio whatsapp api

Question

I am using .NET core with react template I am using twilio for WhatsApp messages, and it is working fine. Even I am able to send image file also.

but when i am sending a video I am not receiving any message.

My code

TwilioClient.Init(_accountSID, _authToken);

string mediaUrlString = null;
Uri mediaUri = null;
List<Uri> mediaUrls = null;
messageDto.MediaUrl = "https://videos.pexels.com/video-files/4114797/4114797-uhd_2560_1440_25fps.mp4";

if (!String.IsNullOrEmpty(messageDto.MediaUrl))
{
    mediaUrlString = messageDto.MediaUrl;
    mediaUri = new Uri(mediaUrlString);
    mediaUrls = new List<Uri> { mediaUri };
}

var message = await MessageResource.CreateAsync(
            //   from: new Twilio.Types.PhoneNumber(_twilioWhatsAppNumber),
               from: new Twilio.Types.PhoneNumber("My-Twilio-Number``your text``"),
               body: messageDto.SMSBody,
               mediaUrl: mediaUrls,
               to: new Twilio.Types.PhoneNumber("whatsapp:+" + messageDto.ToPhoneNumber),
               statusCallback: new Uri(baseUrl+ "/Support/ReceiveWhatsAppStatus"));

For now I am using above url which is publicly accessible

what could be the issue

I'm expecting where I am making mistake, and how to resolve this

In the image You can see a link "Invalid content"

Here is the link :