Resize and replace all files in Laravel request based on size

I'm currently writing a middleware to detect when a file is being uploaded to manipulate it. The aim is to detect any/all images on the application that have a height or width that is larger than 500px, and if it does then resize it before allowing the request to continue.

At the moment I have this middleware with this image loop

class CheckImageSizes
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        //Get each of the files that are being uploaded in the request, if there are no files this will just be ignored.
        foreach (array_flatten($request->files->all()) as $file) {
            $image = Image::make($file);
            if($image->height() > 500 || $image->width() > 500){
                //Resize the image here and replace it in the request
            }
        }

        return $next($request);
    }
}

Inside my if statement, how would i replace the image in the request and then return it so that when my controller processes the image, it handles the newly resized image?

via Chebli Mohamed