Hello, Yes you can [URL] 
i want to know can i use M.2 2280 Gen 3*4   2TB ? on manual  << click Table 1. Storage specificationsSTORAGE TYPE                      INTERFACE                TYPE CAPACITYM.2 2230 solid-state drive  PCIe Gen3 x4 NVMe  Up to 1 TB M.2 2230 solid-state drive  PCIe Gen4 x4 NVMe  Up to 1 TB M.2 2280 solid-state drive  PCIe Gen4 x4 NVMe  Up to 2 TB  
Dell G15 5520 can i upgrade M.2 ssd 2280 gen 3 (manual said gen4) ?