Myself and few others get around 215GB extra space of OneDrive.
1. Log in 1st time, got 100GB and turned off auto camera upload.
2. Few days later, suddenly pop up mess to get 100GB and need to log in. Did it and 100GB space again and turned off camera upload again. Closed the app.
3. Directly it pop up again for me to log in to get 100GB , but this time I get only 15GB.
Dont know whats wrong with OneDrive, but cant complain with 215GB extra space and now I have 346GB of space with OneDrive.
Mine S6 is unlocked version.