As someone else also mentioned it in the thread, my experience was that you could upload folders/files but when it comes to download back, I could not download the folders. I gave up the moment I saw that limitation.
Dropbox doesn't have such restrictions, nor do any other such service I have experienced in the free tier.
Box allows you to download any files or folders. It's better than Dropbox in one respect because it automatically keeps a certain number of versions of a file (up to 25 I think) so you can easily backdate to a legacy copy in case of emergency.
Dropbox doesn't have such restrictions, nor do any other such service I have experienced in the free tier.