The slots do not support bifurcation, so any adaptors will either need their own controller, or will be limited to 2 drives if you want to stick with NVMe drives. System also supports 2 regular SATA SSD drives, 2.5", which is a lot easier to install than an additional NVMe drive, in 2 caddy's located in the bottom of the case. It also supports a 3.5" drive at the front of the case with a caddy.
I'm looking into getting a Aurora R10 Ryzen with a 512 GB NVMe boot drive and a 2 TB 7200 RPM Sata drive. But want to know what my options are for upgrading and adding more storage later down the road. This will be my first desktop, but I'm comfortable using guides and youtube to open the case up and install new drives in the future. I hear that there's only one M.2 slot on the motherboard and I'd need to get a PCIe adapter for a second one, but are there any open PCIe slots on the motherboard? Any open SATA drives? Thanks!
Aurora R10, add storage? #3