I'm creating a simple multiple selectable dropdown using jQuery amsify Select

this is my User interface

this is my user inter face code

<label for="medium_id" class="col-form-label">Medium</label>
<select class="form-control " multiple="multiple" id="medium_id" name="medium_id[]">
<option value="">Select Medium</option>
    @foreach( [$medium][0] as $medium)
         <option value="{{$medium->id}}">{{$medium->name}}</option>
    @endforeach
 </select>

this is my Laravel storing to database code

foreach ($request->medium_id as $medium)
{
    medium_classes::create([
         'classes_id'=>$classes->id,
         'medium_id'=>$medium
    ]);
}

this is my jQuery code

<script>
$('select').amsifySelect({
   type :'bootstrap',
   searchable : true
});
</script>

and this is dd() output in here that multiple select sending data's multiple times 😢

any one can you help me