How many drives can the Lenovo ThinkCentre M70q Gen 2 support?

The Lenovo ThinkCentre M70q Gen 2 caps out at one NVMe SSD and one SATA drive. It has an M.2 2280 slot for NVMe PCIe Gen 3 x4 SSDs and one 2.5-inch SATA III bay, with no second SATA port for external drives.