autocde2.0/app/Http/Requests/API/Approval/ActionRequest.php

<?php

namespace App\Http\Requests\API\Approval;

use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Validation\Rules\File;

class ActionRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     */
    public function authorize(): bool
    {
        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array<string, \Illuminate\Contracts\Validation\ValidationRule|array<mixed>|string>
     */
    public function rules(): array
    {
        return [
            "status" => "required|in:1,2",
            "comment" => "max:255",
            "signature_file" => [
                'file',
                File::types(['pdf'])->max("10mb")
            ]
        ];
    }
}