I recently bought Nitro 5 AN515-43-R2M9 which is a non SSD varient. I am planning to install SSD but not sure whether only one M.2 SSD slot is there or 2 M.2 SSD slots (obviously I don't want to void my warranty hence not going to perform installation on my own

). I hence called ACER support team and they said that there are two M.2 slots...1 is PCIexpress NVMexpress supported & 2nd is M.2 SATA only.
When I asked for how much both support, they said that
M.2 slot 1 PCIexpres/NVMexpress supports up to 512 GB
M.2 slot 2 SATA only supports up to 1 TB
But engineer was not looking confident as earlier he said that it only supports 128 GB NVMexpress then when I said that "I did bit of research on Google, I found that it supports up to 2 TB...!!!???"; Engineer then changed his statement stating that it supports up to 512 GB.
So here I got confused and need help to know exactly how many M.2 slots does my version Nitro 5 AN515-43-R2M9 supports and how much both upto?