upload file doesnt work laravel

I want to upload a photo with item (which here is a book) that i'm creating.

It worked perfectly on localhost but when I uploaded it on a shared host it stopped working.

I user Intervention package and here is my code :

.

$orgName = $request->file('img')->getClientOriginalName();
        $path = public_path('img/'.$orgName);
        $paths = "";
            if(file_exists($path)){
                $orgName = str_random(20).$orgName;
                $path = public_path('img/'.$orgName);
                Image::make($request->file('img'))->fit(320,150)->save($path);
                $paths.='img/'.$request->name.'/'.$orgName."_&_";
            }
            else{
                $path = public_path('img/'.$orgName);
                Image::make($request->file('img'))->fit(320,150)->save($path);
                $paths.='img/'.$request->name.'/'.$orgName."_&_";
            }
        $book->img=$paths;

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