SSD adaptor for Dell Lattitude 5400

I remember when I was upgrading my Lattitude 5400 from HDD to SSD m.2, I was very bitter about leaving a huge gaping hole in my laptop which I felt like is a prime piece of real estate that can be reclaimed for adding extra storage. So in my research efforts i am come to understand that there are 4 ways to ass extra storage to this laptop

1. use a type c high speed ssd external drive
2. use the WWAN port to hook up a 2242 m.2 ssd to it
3. M.2 ssd OEM adaptor.
4. the native adaptor for HDD

The easiest way is to get a 2242 m.2 and hook it up and forget. but I dont like easy and also I would like to keep the WWAN port empty so i can hook up a m.2 to pcie extension adaptor to hook up a gpu to the laptop maybe later.

So this leaves me with the native HDD adaptor., the motherboard has a slot that accepts a adaptor which connects to your SATA drive, I assume this port is run at sata 3 speeds and not NVMe. I was thinking if anyone can shed more light on this adaptor...

Amazon link to a replacement part for reference

https://www.amazon.com/Suyitai-Repl...erposer+Connector+Cable&qid=1637619892&sr=8-3


with the above adaptor, I can hook up a M.2 to a SATA adptor and get it to work but I prefer no go that route. I want to first confirm if the slot on the port supports nvme or just SATA3 ? can someone help me...

 

I am attaching the picture of the HDD slot on the mother board for further clarity