They're going to tell you that your storage is full, whether it is or not. You can literally have 5 music files in your folder, and they're going to tell you that you've used 99Gb of your 100Gb.
It would be laughable, if it weren't so sad. And there is *NO* support. You can't email anyone there to discuss your issues; you only have the option of asking questions in a Community Forum, where everyone is just as lost and unhappy as you are.
Box.com is a ripoff. Period.