ScreenshotIos.cs

private IEnumerator Screenshot_Coroutine()
{
    yield return new WaitForEndOfFrame();
    Texture2D screenshot = ScreenCapture.CaptureScreenshotAsTexture();
    string screenshotBase64 = Convert.ToBase64String(screenshot.EncodeToPNG());

    var bytes = Convert.FromBase64String(screenshotBase64);
    using (var imageScreenshot = new FileStream(PathFileScreenshot, FileMode.Create))
    {
        imageScreenshot.Write(bytes, 0, bytes.Length);
        imageScreenshot.Flush();
    }
}