Can I add an extra SSD to my Lenovo Legion 5i laptop?
Lenovo Legion 5 15 inch - DIY adding an internal SSD - YouTube
How to upgrade or add an SSD to Lenovo's Legion 5i 15 | Windows Central
Yes, Legion 5 Pro has two NVMe PCIe 3.0 2280 SSD slots, the second slot is empty and has a pre-installed heatsink with a thermal pad. (I installed Samsung 970 Evo 1TB