Which SSD Will this TC-780 motherboard and BIOS support (follow-up)

Seeking clarification on a previous post:

Is this an M.2 slot/connector?

Is the smaller slot on the right a PCIe? the key seems to be in a different place.

Thank you!

Accepted answers

Below is the SSD types:

OK, so will it not support a 2TB M.2 SSD or was 512GB the largest M.2 SSD available when the info above was published?

Also, how is a M.2 SSD inserted?

That slot doesn't look like any of the others:

you can insert a M.2 even a 2 TB might work. But Acer recommends till 512GB