Hi, I have a ACER G3-571-77QK with 512 GB SSD and 2x8 GB RAM. I wanted to upgrade the storage with an additional 2TB SSD. But it looks like there is already a drive in the space provided for the SSD with the caddy and all. I understand that this model comes with 256 GB SSD. I want to know if I can still upgrade it or the extra 256 GB is from the drive which is already present in the slot? I still see only a single partition with 512 GB on my computer.