Dropbox adds two-step verification with app
August 14th 2017
Dropbox:
Starting today, you can also use the Dropbox mobile app to verify your identity. When you're signing in, you can have a notification sent to the Dropbox app on your phone, and simply tap a button to finish the process, rather than receiving a text message with a code to enter.
Mobile prompts are especially helpful as a backup when you don't have cell signal, but do have Wi-Fi (for example, on a plane where you can't receive security codes by text message).
This should make it a little easy for all users to utilize two-step verification. Going to the app is probably no easier than using a third-party authenticator app, however, not everyone bothers to set that up and maintain it.