Some notes before anyone flashes/uses this app:

1. It doesn't really matter what android version you're using, after flashing it will ask you to update the app. I wouldn't recommend that before logging in.
2. If you already had the 50GB for one year promotion on your account (from your Samsung device), this WILL NOT WORK THE SECOND TIME, as Dropbox says on the details about the promotion (tested and verified).
3. Theoretically, it shouldn't matter what phone you're using, as (I suppose) he extracted the app from a genuine Samsung phone and just made it flashable and there's little to no chance of doing any harm to the phone. Why? Because if your phone is rooted and you know how to flash files, you already know how to remove a system app.

I tried it but it didn't work for my account, as already stated at point 2.

Thanks for sharing anyway.