Empty m.2 slot for Probook 450 G4

[trialkim]

There is a m.2 space just below 2.5" SSD space.

But, I can't see m.2 "slot" (or socket).

Is this because my laptop is the most inexpensive version of Probook 450 G4?

I can see from YouTube tutorials that there IS m.2 slot of most of Probook 450 G4.

[Huffer]

Its hidden up under the plastic chassis but if you have no M.2 slot where this shows this guy inserting the gold leads then you have no M.2 slot:

inserting M.2 under edge of case of laptop

The Manual does seem to imply that all versions of the 450 G4 should have this slot where shown in the picture. Which processor does yours have?

[trialkim]

Thank you very much for your great reply, Huffer.
The processor is Pentium Gold 4415U.
The new price was around $380.
Real value for money!
I have believed that I can add another M.2 (despite SATA-3) to the slot ever before purchasing it.
But, I am really surprised to find out "NO" M.2 slot (insert or socket).
Yes, it should have been there.
I gather that HP deliberately removed the M.2 slot to save the production cost for the lowest tier's Pentium model.

[Huffer]

Yes although the Manual does not mention a Pentium option on this series I am not aware of HP's having an M.2 slot on any laptop with Celeron or Pentium CPU. Nor really any other manufacturer.