fileupload.php

<?php

use Illuminate\Http\UploadedFile;

class SomeController extends Controller {
  
  // loop example
  public function store(Request $request)
  {    
    if($request->hasFile('files')) {
      collect($request->file('files'))->each(function(UploadedFile $file){   
        $this->validateFiles($file);
        $filesname = $file->store('folder-name', ['disk' => 'public']);
        
          // Will output: "folder-name/randomstring.jpg" (if you uploaded a jpeg)
         dd($filename);
      });
    }
  }
  
  /**
  *
  * Validate the uploaded files
  */
  private function validateFiles(UploadedFile $file) 
  {
        // https://laravel.com/docs/5.6/validation#rule-file
        $validator = Validator::make($request->all(), [
            'file' => 'file,max:8000'
        ]);
    
        if ($validator->fails()) {
            return redirect()->back()
              ->withErrors($validator)
              ->withInput();
        }    
  }
}