How to get Office 365 document sharing to actually work

You know how in the movies the monster lopes along yet always somehow catches the screaming girl who's running away from it? That's been the story of Office 365, Microsoft Office, and OneDrive, the three pillars of Microsoft's attempt to move its productivity suite into a collaboration tool, both across users and across devices. But now, after years of progress and piecemeal rollouts, Microsoft has finally pulled together the pieces into a cohesive package and delivered on the original collabor