Keep getting "Method Illuminate\Database\Eloquent\Collection::addMedia does not exist." Error

[OccTherapist]

Hi,

I installed a testcase and tried to use the library on a project, but I keep getting this error. I used the package before, but now it does not work.

Here is my usecase:

    Route::post('/test', function () {
        $article = Article::inRandomOrder()->get();
        $article->addMedia(request()->file('img'))->toCollection();
    
        return $article->getMedia();
    });

And here is my model:

      namespace App;
      
      use Illuminate\Database\Eloquent\Model;
      use Spatie\MediaLibrary\HasMedia;
      use Spatie\MediaLibrary\InteractsWithMedia;
      
      class Article extends Model implements HasMedia
      {
          use InteractsWithMedia;
      }

What have I missed?