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
Amazon.com: WD_BLACK 500GB SN850 NVMe Internal Gaming SSD Solid State Drive with Heatsink - Works with Playstation 5, Gen4 PCIe, M.2 2280, Up to 7,000 MB/s - WDS500G1XHE : Electronics
WD Red™ SA500 NAS SATA SSD 500 GB to 4 TB 2.5”/7mm cased | Western Digital
How to Install 2.5" HDD or SSD in Acer Nitro 5 Gaming Laptop (2019 ver) SATA III Drive - YouTube
Amazon.com: ORICO 2.5 SSD SATA to 3.5 Hard Drive Adapter Internal Drive Bay Converter Mounting Bracket Caddy Tray for 7 / 9.5 / 12.5mm 2.5 inch HDD / SSD with SATA III Interface(1125SS) : Electronics
The best SSD for your PlayStation 5 | Engadget
Upgrading Ram and SSD for Acer Nitro 5 AN515-55-53AG — Acer Community