A:Answer I did add 32gb stick of:
https://www.amazon.com/dp/B09XB3ZNHC?psc=1&ref=ppx_yo2ov_dt_b_product_details
For a total of 40gb. Works great. Unlike ddr4, ddr5 works in dual channel, without matching stick size.
Keep in mind: this machine has 8gb soldered in, and 8gb replaceable.