Upload multiple images in Vue.js and Laravel

I'm trying to upload multiple files at once in vue.js and laravel, Code that i'm using is :

Vue.js code:

 <input type="file" v-validate="'required'" multiple @change="uploadDegree" name="uploadDegree" placeholder="Upload Degree"/>

  uploadDegree(e)
            {
                for (let file of e.target.files) {
                    try {
                        let reader = new FileReader();
                         reader.onloadend = file => {
                         this.user.degree_attachment= reader.result;
                        };
                        reader.readAsDataURL(file);                      
                    } catch {}
                }
              }

Laravel Code:

 $files = $request->input('degree_attachment');
           foreach($files as $file) {
               $degreename = time() . '.' . explode('/', explode(':', substr($file, 0, strpos($file, ';')))[1])[1];
                $pathDegreeExist = public_path("img/degree_img/"); 
                if(!File::exists($pathDegreeExist)) File::makeDirectory($pathDegreeExist, 777);
                $img = \Image::make($file);
                $img->save(public_path('img/degree_img/').$degreename); 
                $newUser->degree_attachment = $degreename;
            }

I'm getting this error :

Invalid argument supplied for foreach()

where i'm trying to get image,

via Chebli Mohamed