To test the beta version of the Dropbox app for Android, visit the beta testing sign-up page.
Once you've installed the beta version, you'll receive updates regularly through the Google Play Store.
Please note that beta products usually haven't been subjected to the same reliability, availability, and security testing as other Dropbox products. You can uninstall the beta version and revert to the regular Dropbox app at any time.
Does Dropbox have a beta program for iOS?
Dropbox has a limited beta program for iOS users, which is currently closed pending future updates.