Here's a video on the disassembling of the HP Pavilion 15-cx0000 Laptop PC.
https://www.youtube.com/watch?v=uDFgqXlLaY4
It should be similar enough to your 15t-cs200 Laptop PC.
As you can see in the video, the 256Gb NVMe SSD is completely different from the 1TB HDD.
So, you can't just swap them.
I suggest you simply replace the 256Gb NVme SSD for a 1TB NVMe SSD.
Here's the upgrades page from Crucial :
https://www.crucial.com/compatible-u...lion-15t-cs200
Signed: Ensign Tzap