How Do I Access Multiple Views Using A Single Controller

Hi! i'm new in asp.net mvc, i made a controller name gallery, view name index, i also made a another view name picture gallery inside the gallery controller, In index view i made a button like folder , when i click that button i go to the gallery picture view, but there is problem when i click it says Resource cannot be found. Here is my code of gallery view

<div class="container" style="padding:100px">
    <div class="row">
     <div class="col-lg-9">
<a href="@Url.Action("PictureGallery", "Gallery")" class="btn btn-primary" style="width:200px; height:200px"></a>
</div>
</div>
</div>

public class GalleryController : Controller
    {
      
        public ActionResult Index()
        {
            return View();
        }
        public ActionResult PictureGallery()
        {
            return View();
        }