I DO have a Box account. Yet, when my brother sent me an invitation to a folder with some pictures in it, I got ONLY the option to set up a new account. After a playing around with all available options, I somehow (do not recall, HOW) succeeded in having that folder placed among the files in MY account. Yet, when I viewed the pictures my brother sent me, I "downloaded" only one file - thinking I could go back to that folder later. But that is apparently not the case. I can seen the ONE file I downloaded. Everything else seems to have evaporated / disappeared is seems to be not visible / assessible any longer. If this is the way it is supposed to be working, Box is a very risky and unpractical business.