It is possible to upload and obtain documents to/from router applying winbox drag & drop functionality. You may as well down load file by pressing proper mouse button on it and picking "Obtain". To update Winbox 3.0 Rc6, you may possibly down load the latest version through the official MikroTik https://josueblxjt.blogdal.com/37571265/the-smart-trick-of-winbox88-that-no-one-is-discussing