Laravel Voyager - upload image on front-end with custom form

I'm working with the voyager (Laravel). I have a model with an image field, this model was created in the backoffice and I already have CRUD for it. I wanted to create a form in the frontend so there could be submited of unlogged users. But I do not know how to upload to follow the same rules that the voyager uses in the backoffice (automatically generated CRUD)

Any help? Thank u

via Chebli Mohamed