I have being trying to submit this form for a product but since almost 1 week I can’t but when I make the form as an axternal file it works [closed]

Trying to submit a form for a product addition

I try to submit a form it turns, but no addition to the databases, tried it several times but nothing
But when I change and instead put the form as a external php file on its own it works….and I don’t really see what the problem is with this page

The php code here is the select from the tables so on this same page I want to print and submit products but when I submit it no product added don’t really know if did something wrong on this page specifically

      </style>

            <!-- <a href="add.php" style="padding-left: 88%;"><button class="view" style="background-color: lightseagreen;">+ AddNew</button></a> -->

            <button class="view"
               onclick="togglePopup()"  style="width: 160px; background-color: lightseagreen;">+ AddNew</button>

               <a href="add11.php">+ AddNew</a>

        <div class="report-container">
            <div class="report-header">
                <h1 class="recent-Articles">Products Info</h1>
                <button class="view"><?=count($productss)?> Products</button>
                <button class="view">Products List</button>
                <!-- <div class="view" width="10px">Products List</div> -->
            </div>

            <div class="report-body">
                <div class="report-topic-heading">
                    <h3 class="t-op" style="margin-right: 60px;">Product Image</h3>
                    <h3 class="t-op" style="margin-right: 60px; margin-left: 30px;">Category</h3>
                    <h3 class="t-op" style="margin-right: 70px; margin-left: 40px;">Name</h3>
                    <h3 class="t-op" style="margin-right: 60px; margin-left: 30px;">Price</h3>
                    <h3 class="t-op" style="margin-right: 60px; margin-left: 30px;" >Quantity</h3>
                    <h3 class="t-op" style="margin-right: 60px; margin-left: 30px;">Actions</h3>
                    <hr>
                </div>

                <div class="items">
                       <?php foreach($productss as $item){
                                        
                                         $sql = "SELECT * FROM product_category WHERE category_id = :id";
                                            $statment = $db->prepare($sql);
                                            $statment->bindvalue(':id', $item["category_id"], PDO::PARAM_INT);
                                            $statment->execute();
                                            $product_categorys = $statment->fetchAll(PDO::FETCH_ASSOC);
                                            $product_category=$product_categorys[0];
                                            $item["category_names"]=$product_categorys[0]["category_name"];
                 ?>
                
                    <div class="item1"> 
                        <h3 class="t-op-nextlvl" style="margin-right: 60px;"><img src="../upload/<?=$item["product_image"]?>" width="80px"></h3>
                        <h3 class="t-op-nextlvl" style="margin-right: 60px; margin-left: 30px;"><?=$item["category_names"]?></h3>
                        <h3 class="t-op-nextlvl" style="margin-right: 60px; margin-left: 30px;"><?=$item["name"]?></h3>
                        <h3 class="t-op-nextlvl" style="margin-right: 60px; margin-left: 30px;"><?=$item["price"]?></h3>
                        <h3 class="t-op-nextlvl" style="margin-right: 60px; margin-left: 30px;"><?=$item["qty"]?></h3>
                    <hr>
                          
                    <form method="POST" action="" style="display: flex; flex-direction: row;">    
                    <h3 class="t-op-nextlvl" style="margin-right:46px;"><a href="Delete.php?id=<?=$item['product_id']?>"><img src="../Icons/delete.png" width="30px" alt=""></a></h3>
                         <input type="hidden" value="<?=$item['product_id']?>" name="id" id="">
                             <button name="submitbtn" type="submit" style="border: none;"><img src="../Icons/edit.png" alt="edit" width="35px"></button>
                    </div>
                    <?php
                }
                  ?>
                </div>
            </div>
        </div>




        <div id="popupOverlay"  class="overlay-container" style="padding-bottom: 30px">
<div class="popup-box" style="width: 570px;">
    <h2 style="color: green;">Add A Product</h2>


        <form method="post" action="" enctype="multipart/form-data" style="padding-top: 20px; padding-left: 40px;">
    <div id="feedback-form">
        <h2 class="header">New Product</h2>
        <div>
            
        <section>
          <div class="select-containers">
     <select class="select-box" name="category_id" id="">
        <option value="" selected disabled>
          Choose The Product Category
        </option>
        <?php 
        foreach($product_categoryss as $item1){
           ?>
           <option value="<?=$item1["category_id"]?>"><?=$item1["category_name"]?></option> 
           </div>
           <?php
        }

        ?>
        
        <input type="text" name="name" placeholder="Product Name" required></input>
          
        <input type="number" name="price" placeholder="price" required></input>

        <input type="number" name="qty" placeholder="Quantity" required></input>

        <input type="text" name="description" placeholder="description" required></input>

        <input type="file" name="product_image" placeholder="Main Image" required></input>
    
        <input type="file" name="product_image1" placeholder="Image1" required></input>

        <input type="file" name="product_image2" placeholder="Image2" required></input>

        <input type="file" name="product_image3" placeholder="Image3" required></input>

        <input type="file" name="product_image4" placeholder="Image4" required></input>


            <button type="submit">Submit</button>
            </section>
    <!-- <center>
        <input type="reset" class="btn btn-dark" value="Cancel">
        <input type="submit" class="btn btn-primary" name="envoyer" value="Add">
    </center>     -->
  </form>

  
  <button class="btn-close-popup" onclick="togglePopup()">Close</button>
</div>