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
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How to upgrade the SSD in your Lenovo ThinkPad T490 | Windows Central
Lenovo ThinkPad T450 i5-5200U 8GB New hard drive 240GB SSD 1600x900 Class A Windows 10 Professional NEW 240GB SSD \ Windows 10 Professional | Laptops \ Brand \ Lenovo \ Lenovo ThinkPad