MSI Thin GF63 15.6" Gaming Laptop

the 512GB Drive will be a NVME Drive that is in it.

it has 2 Storage Slots:

1x M.2 SSD slot (NVMe PCIe Gen4) <<< that is what your OS is on but should support nearly any M.2 NVME SSD
1x 2.5" SATA HDD <<< that one will be empty

so it depends what your trying to do that SATA Drive would be a Easy Upgrade as its just put it in and go to disk Manage and Format it and give it a drive letter but upgrading the NVME Drive means you would probably need a USB to M.2 PCI-E Adapter and clone your internal Drive to it then swap it over.
No just the SSD i want to. Also I want to know since im buying it from this store and their stock are kept in their warehouse and they buy it from MSI, Is the motherboard programmed? What I mean is if it's programmed due to some gaming laptops could contain a programmed motherboard that will not allow you to swap RAM or you can but the RAM needs to be the same brand RAM the laptop came with from manufacture.