What is an Expansion Slot and How Does It Work?

This video explains how to select which slot to use on a motherboard for the best storage

You have 2x M2 2280 slots up to 1tb and 1x2,5` SATA HDDSSD slot up to 2tb When you open the laptop check if the free

m2_1 slot 5-Port SATA Gen3 6Gbps Non-RAID PCIe storage expansion card · View More Add to compare ECM27 1-slot NVMe and 2-slot SATA SSD to PCI-E x4 adapter Card

m2 pcie slot I don't think this system is SSD