Proton Drive is an end-to-end encrypted file hosting service with a strong focus on privacy. It is a product from the Swiss company Proton, which is also the maker of Proton Mail, Proton Calendar and Proton VPN.
The plans of Proton Drive are bundled together with Proton Mail and Proton Calendar. They offer a free plan with 1 GB of storage.
Read more on the pricing page of the service.