Call controller Action Method from Widget

Hi. I am developing my first plugin, but right now I am stuck trying to call a Controller Action Method from the Widget view.  No error is returned, but submit button does not reach the controller. What am I doing wrong?

The Widget view looks  like this:

@model Nop.Plugin.Widgets.Expressions.Models.PublicInfoModel
@{
    Layout = "";
}
<div class="container" style="margin: 2px; padding: 2px"> 
  @using (Html.BeginForm("PublicInfo", "WidgetsExpressions", FormMethod.Post,
                         new { enctype = "multipart/form-data", id = "ImgForm", name = "ImgForm", target = "UploadTarget" }))
                            {
                                <input type="hidden" name="productId" value[email protected] />                                
                                <input type="hidden" name="image" id="input_elem" />
                                <button class="btn btn-success" id="submitbutton" type="submit" value="Submit">Save photo</button>                                
                            }
</div>

The Controller Action Method goes:

public class WidgetsExpressionsController : BasePluginController
    {
    public async Task<ActionResult> PublicInfo(string widgetZone, object additionalData) 
      {
        FormCollection _form = (FormCollection)additionalData;
        
        //Some code here
        var model = new PublicInfoModel();
        //Some more code...
        return View("~/Plugins/Widgets.Expressions/Views/PublicInfo.cshtl", model);
      }
  }

And the RouteProvider

 endPointRouteBuilder.MapControllerRoute("Plugin.Widgets.Expressions.WidgetsExpressions.PublicInfo", "Plugins/WidgetsExpressions/PublicInfo",
                new { controller = "WidgetsExpressions", action = "PublicInfo" });

Thanks

If you're using a Form to get there, you may need a [HttpPost] attribute on your Action method.   Also,  use the browser dev tools to be sure a request is being made.   ​However...

Typically the PublicInfo method is used to deliver the widget 'content'.  You may want to us another method for your "processing", and also consider using Ajax.

Thank you so much New York for your suggestions. Actually, HttpPost attribute was yet there, I just forgot to include it in this Post. To implement your suggestion, I created a new controller (Photo) with an ActionResult method (TakePhoto) and added the ajax code to the view (PublicInfo.cshtml):

@model Nop.Plugin.Widgets.Expressions.Models.PublicInfoModel
@{
    Layout = "";
//Some Html here...
                        <div class="col-sm-6">                           
                            <form id="AjaxForm">
                                <input type="hidden" id="productId" value[email protected] />
                                <input type="hidden" id="expressionName" value[email protected] />
                                <input type="hidden" id="role" value[email protected] />
                                <input type="hidden" id="counter" value[email protected] />
                                <input type="hidden" id="input_elem" name="image" />
                                <button class="btn btn-success" id="submitbutton" type="submit" value="Submit">Save photo</button>
                            </form>                        
</div>
                   
<script language="javaScript">
    (function () {       
        //=====================================       
    $(document).ready(function () {
        $("#AjaxForm").submit(function (e) {
            e.preventDefault();           
            // Deshabilitamos el botón de Submit
            $("#SubmitBtn").prop("disabled", true);

            var data = canvas.toDataURL('image/png');

                $.ajax({
                    url: "@Url.Action("TakePhoto", "Photo")", // Url
                    data: {
                        // Datos / Parámetros
                            ProductId: $("#productId").val(),
                            ExpressionName: $("#expressionName").val(),
                            Role: $("#role").val(),
                            Counter: $("#counter").val(),
                            Photo: $("#input_elem").val(data)
                    },
                    type: "post"  // Verbo HTTP
                })
</script>

And changed RouteProvider:

namespace Nop.Plugin.Widgets.Expressions
{
    public partial class RouteProvider : IRouteProvider 
    {
        public void RegisterRoutes(IEndpointRouteBuilder endPointRouteBuilder)
        {           
            endPointRouteBuilder.MapControllerRoute("Plugin.Widgets.Expressions.WidgetsExpressions.Configure", "Plugins/WidgetsExpressions/Configure",
                new { controller = "WidgetsExpressions", action = "Configure" });

            endPointRouteBuilder.MapControllerRoute("Plugin.Widgets.Expressions.BookExpressions.AddExpressiontoBook", "Plugins/BookExpressions/AddExpressiontoBook",
                new { controller = "BookExpressions", action = "AddExpressiontoBook" });

            //This is my public endPoint
            endPointRouteBuilder.MapControllerRoute("Plugin.Widgets.Expressions.Photo.TakePhoto", "Plugins/Photo/TakePhoto",
                new { controller = "Photo", action = "TakePhoto" });
        }
        public int Priority => -1;
    }
}

However, it is not working. Url route cannot be found. As controllers and the view component are within a dll file, I guess a reference has to be added to the assembly controller with Microsoft.AspNetCore.Mvc.ApplicationParts, as mentioned here. But the problem is that I don't know how to do that. Can anyone please explain how to do this in NopCommerce 3.1 ?
Also, I am not sure how the Url Route pattern goes in RouteProvider. I have tried with: "Photo/TakePhoto" "Plugins/Photo/TakePhoto", "Plugins/Widgets.Expressions/Photo/TakePhoto",with no luck. An explanation will be appreciated.

Thanks in advance.
Dumar

Well, according to this, it seems I am going in the right direction. I tried to add my plugin controller in the nop.web/statup.cs class this way (just as it is done here:

 // Requires using System.Reflection;
            var assembly = typeof(PhotoController).GetTypeInfo().Assembly;
            services.AddMvc()
                .AddApplicationPart(assembly)
                .SetCompatibilityVersion(CompatibilityVersion.Version_3_0);

But I am getting a CS0246 error (The type or namespace name 'type/namespace' could not be found (are you missing a using directive or an assembly reference?)) by the typeof operator.
What should I do to solve this?  Or, I am taking it the wrong way, how can be this issue addressed ?