validating array of input fields not working in firefox. chrome okay

hi,

i am working in multiple file upload using $request->all(). everything working fine in local development environment for common browsers(firefox and chrome). but in production its not working in firefox browsers and it throws validation error message after i selecting a file too

local env windows 10 php 7.1

production env ubuntu 17 php 7.2

here's my code for you to check

<form method="post" action="{{ route('file.store') }}" enctype='multipart/form-data' files="true">
    <input type="file" name="file_id[]"  multiple="multiple" required/>
</form>

private $rules = ['file_id.*', => 'required'];

private $message = ['file_id.*.required' => 'file is required'];

// validate method
public function validate($data // all the requests) {
    return  Validator::make($data, $this->rules, $this->message);
}

any helps or hints. thanks