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you can natively email your files to dropbox, along with other input methods like via fax/phone/file upload, etc

You can? Because as of a couple days ago people were still asking for it via their idea forums: https://www.dropbox.com/votebox/20/email-files-to-dropbox

Where do I find my dropbox email?

I think the OP might be confusing DropBox with drop.io