Messaging, it turned out, appears to be a better center of gravity than documents. And while Dropbox (barring significant traction in its new products) seems to be fading in its centrality, what’s striking is that Slack’s victory seems hollow as well.

I have thousands of photos of my children but few that I’ve set aside to revisit. I have records of virtually every text I’ve sent since I was in college but no idea how to find the ones that meant something. I spent years blasting my thoughts to millions of people on X and Facebook even as I fell behind on correspondence with dear friends. I have ... See more