How to use same form in laravel for upload file?

How to use same form in laravel for upload file?

I use same form for uploading images in laravel.

{!! Form::file('featured_img', ['class'=>'form-control']) !!}

When i submitted the form, it worked like a charm. but it didn't work when i submitted at edit mode. i try to var_dump the request and got this.

add mode :

[featured_img] => Symfony\Component\HttpFoundation\File\UploadedFile Object ( 
...
)

edit mode :

[featured_img] => maintenance.jpg

What should i do?

via Chebli Mohamed