Image product upload and update file upload problem Laravel 7 Jquery

1. I would like to know why all the required data cannot be inserted in the database table name - products. I am now experiencing this problem. I cannot upload pictures:

   In Controller

          public function postCar(Request $request){
             $this->validate($request, [
   
             'repo_yard'       => 'required',
             'status'          => 'required',
             'img'      =>   'required',
              'img' => 'required|image|mimes:jpeg,png,jpg,gif,svg|max:2048'
   ]);    
   

   Upload image same controller

       $ads = new Product;
       $images = $request->file('img');
       $count = 0;
       if($request->file('img')){
       foreach($images as $item){
       if($count < 4){
       $var = date_create();
       $date = date_format($var, 'Ymd');
       $request->img->storeAs('public/uploads');
       $imageName = $date.'-'.$item->getClientOriginalName();
       $item->move(public_path().'/uploads/',$imageName);
       $url = URL::to("/").'/uploads/'.$imageName;
       $arr[] = $url;
       $count++;
           }       
        }
       $image = implode(",", $arr);
       $ads->status = $request->input('status');
       $ads->image =  $image;
       $ads->save();
       return redirect('/')->with('info', 'Product published successfully.');
   
    } 
   }
   

   In blade.php

     <div class="col-lg-12">
      @if(session('info'))
      <div class="alert alert-success" style="margin-top: 5px;">
      
      </div>
      @endif
   </div>
   

   another blade.php

   <div class="col-lg-6">
     <div class="col-lg-12">
     <div class="form-group">
     <label><strong>Photos of your vehicle (Max 4)</strong></label>
   <input type="file" class="form-control" name="img[]"  multiple=""/>
     </div>
     </div>
     <label></label>
    @if($errors->has('img'))
   <span class="alert alert-danger" style="margin-left:13px; padding:5px;"></span>
   @endif
     </div>
     </div>
   

via Chebli Mohamed