The filetype you are attempting to upload is not allowed

This is my code

var videoBytes = System.IO.File.ReadAllBytes(filePath+"/" + VideoFileName);
WWWForm www = new WWWForm();
www.AddBinaryData("video", videoBytes, VideoName + ".mp4","video/mp4");
GameController.Post("/uploadVideo",www);

It is work on unity editor(mac os).

But it not work on iphone device.

The error message is "The filetype you are attempting to upload is not allowed".

 

What is your file path? Are you using https://docs.unity3d.com/ScriptReference/Application-persistentDataPath.html