The slot on the back of the Lanix Neuron A v20 case appears to have two notches (two groups of pins), similar to those found on PCIe or NVMe SSDs. However, being a low-end machine, the RAM isn't expandable, leaving limited storage. Since the Intel Celeron 4020 doesn't support PCIe, the only option was to install a SATA 3 M.2 2280 SSD (B+M Key). I made a video of the upgrade storage (128 GB free) .
