Problem saving images online,the image saving works on my local machine

What might be the problem with my code, here is a sample of my controller's code for saving data and image to database, the image saves in database but fails to save to the specified storage image path... public function store(Request $request) { $this->validate($request,[ 'title'=>'required', 'slide_images'=>'image|nullable|max:1999' ]);

    //handle upload file
    if($request->hasFile('gallery_image')){
        //get file name with extension
        $filenameWithExt=$request->file('gallery_image')->getClientOriginalName();
        //get just a   file name
        $filename=pathinfo($filenameWithExt,PATHINFO_FILENAME);
        //get just extension
        $extension = $request ->file('gallery_image')->getClientOriginalExtension();
        //file name to store
        $fileNameToStore=$filename.'_'.time().'.'.$extension;
        //upload image
        $path = $request->file('gallery_image')->storeAs('/public/gallery_images',$fileNameToStore);
    }else{
        $fileNameToStore='noimage.jpg';
    }
    //create new post
    $gallery=new Gallery;
    $gallery->title=$request->input('title');
    $gallery->gallery_image =$fileNameToStore;
    $gallery->user_id=0;
    $gallery->save();

    return redirect('/gallery')->with('success','Post created Successfully');
}