Question Where is my SSD located and can I add another one ?

You can fit up to four M.2 NVMe SSDs into slots with IDs starting M2. You can fit up to six 2.5In SATA SSDs or hard disks to the ports on the front edge labelled SATA3.

Best guess is your current drive is plugged into slot M2A_CPU between PCIEX16 and the CPU. An M.2 drive is roughly the size and shape of a stick of chewing gum.
https://en.wikipedia.org/wiki/M.2

1024px-Intel_512G_M2_Solid_State_Drive.jpg
 

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