The enclosure supports compact NVMe M.2 SSDs in 2230 and 2242 formats that you must buy separately. You can get a maximum capacity of 2TB, enough for up to three hours of recording in 4K ProRes.
2 slots for SATA and NVMe drives. Always check the documentation for your NAS enclosure or PC hardware for additional details. So long as the drives you have (or plan to purchase) are compatible ...