How to save uploaded image to Storage in laravel?

I am using Image intervention to save an image to the storage folder. I have the code below and it seems to just save a file name with a blank image. I think I need a way for the file contents to be written to the folder but struggling for the snippet.

if ($request->hasFile('photo')) {
            $image      = $request->file('photo');
            $fileName   = time() . '.' . $image->getClientOriginalExtension();

            $img = Image::make($image->getRealPath());
            $img->resize(120, 120, function ($constraint) {
                $constraint->aspectRatio();                 
            });

            //dd();
            Storage::disk('local')->put('images/1/smalls'.'/'.$fileName, $img, 'public');

Answer

You need to do

if ($request->hasFile('photo')) {
            $image      = $request->file('photo');
            $fileName   = time() . '.' . $image->getClientOriginalExtension();

            $img = Image::make($image->getRealPath());
            $img->resize(120, 120, function ($constraint) {
                $constraint->aspectRatio();                 
            });

            $img->stream(); // <-- Key point

            //dd();
            Storage::disk('local')->put('images/1/smalls'.'/'.$fileName, $img, 'public');
}