I upgraded my Legion 5 Pro (16ACH6H) Ram from 16GB to 64GB : r/LenovoLegion
Lenovo Legion 5 Pro Disassembly (RAM, M.2 SSD upgrade options)
Memory for a Lenovo - Legion 5 Pro 16ACH6 - Kingston Technology
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
Lenovo Legion 5 Pro Review - Unboxing, Disassembly and Upgrade Options - YouTube
Lenovo Legion 5 Pro Review - IGN
Default RAM doesn't have expected performance - Lenovo Legion 5 Pro (2021) Upgrade RAM & WiFi - YouTube
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Legion 5 Pro Memory Upgrade - YouTube
Inside Lenovo Legion 5 Pro (16") - disassembly and upgrade options | LaptopMedia.com