BEWARE: Lenovo Thinkpad L15 Gen3 SSD is practically un-upgradeable. Laptop comes with 256GB and bigger SSD is too thick to fit. There also goes a cooling plate on top. : r/thinkpad
🛠️ How to open Lenovo ThinkPad L15 Gen 3 - disassembly and upgrade options - YouTube
ThinkPad L15 Gen 3 | Intel vPro® powered 15.6 inch business laptop | Lenovo US
Lenovo Thinkpad L15 Gen 3 Ryzen 7 How To Replace Battery Disassembly - YouTube