Laravel $request->file() returns null

You should add to the form tag enctype="multipart/form-data"

For example:

<form method="POST" action="{{route('back.post.new')}}" enctype="multipart/form-data">
.............
</form>

Adding it you can use your custom Request.

I hope this can you help!

Noticed that the $request object I was receiving in the Controller method was an Instance of JsonRequest, which is a custom class (empty for now) that extends Illuminate\Http\Request.

And it's implemented as:

<?php

namespace App\Http\Requests;

use Illuminate\Http\Request;

class JsonRequest extends Request {
}

But if I change:

// from
use App\Http\Requests\JsonRequest;
public function add_background_image (JsonRequest $request) {
  dd($request->file('files'))
  // NULL
}

// to
use Illuminate\Http\Request;
public function add_background_image (Request $request) {
  dd($request->file('files'))
  // UploadedFile {#266
  //   -test: false
  //   -originalName: "item-keymoment.png"
  //   -mimeType: "image/png"
  //   -size: 978274
  //   -error: 0
  //   ...
  // }
}

I get the desired input file. For now switching the instance of $request solves my issue

But I don't understand why/how extending Illuminate\Http\Request with an empty Class breaks things.
Can someone explain?

My intention with subclassing Illuminate\Http\Request was to be able to attach methods on $requests for dealing with exceptions/errors in a unified way for API requests. Such as when in deployment show exception messages, but in production return a fixed message.
Is there different/better/more Laravel way of doing that?
I think will just create a JsonController instead of extending Request.