I had my onsite in January 2021.

Phone: Game of Life (look it up)

Onsite:

1. Reader-Writer Lock
2. All-Around Interview with a Hiring Manager
3. Id Allocator
4. Design a Logging Service

The question packet and solutions can be found here: https://github.com/insideofdrop/Dropbox-Interview-Prep

Got told I'm going to HC, then did team matching and then offer.