customize error message for mimes not working - laravel

Question

I can not customize the error message for mimes
I try the solution given here laravel 5.4 custom error message for MIME not working? but without success
Request :
public function rules()
{
$rules = [
'album'=> 'required',
'add_image.*' => 'image|mimes:png|max:2000',
];
return $rules;
}
public function messages()
{
$messages = [
'album.required' => 'Album is required',
'add_image.mimes' => "Image isn't png",
];
return $messages;
}
Form view :
<form class="addImage" method="post" action="{{route('addImage.form')}}" enctype="multipart/form-data">
{{csrf_field()}}
<select name="album">
<option value="">-----</option>
#foreach($albums as $album)
<option value="{{$album}}">{{$album}}</option>
#endforeach
</select>
<input multiple="multiple" name="add_image[]" type="file" />
<button class="buttonADM" type="submit">Send</button>
</form>
Thanks for your help and sorry for my bad english

Answer 1

You are validating an array, so try this instead:
'add_image.*.mimes' => "Image isn't png",
I used your form on my project, and tried this:
$valid = Validator::make(request()->all(), [
'add_image.*' => 'image|mimes:png'
], [
'add_image.*.mimes' => 'Image isnt png'
]);
dd($valid->errors());
// output
{
"add_image.0": [
"Image isnt png"
],
"add_image.1": [
"Image isnt png"
],
"add_image.2": [
"Image isnt png"
]
}
and I got the custom message. So please check your error bag if it contains the correct messages, and make sure that you print it okay.

Answer 2

i have not same result
Controller
public function addImage(/*addImageRequest $request*/){
if(session('user')['isA'] == 1){
$valid = Validator::make(request()->all(), [
'add_image.*' => 'image|mimes:png'
], [
'add_image.*.mimes' => 'Image isnt png'
]);
dd($valid->errors());
}
}
Return :
MessageBag {#224 ▼
#messages: array:1 [▼
"add_image.0" => array:1 [▼
0 => "The add_image.0 failed to upload."
]
]
#format: ":message"
}