I've ordered a refurbished G3 15 3500 arriving Monday. It has an i5 10300h processor and  the GeForce gtx1650 to graphicsbeoyh a 500 GB NVMe. I want to add more ram and add a second SSD envy Me. It says memory speed is 2933 GHZ. Can I add an 8 GB 3200 GHZ module which will run at 2933, or do I need 2933 or slower?

Secondly the manual states that it will take two m.2 envy me drives but one has to be a 2230, and one a 2280, for both to work. How do I find out if the one already in is a 2230 or 2280, and how do I find which drives on Amazon are 2330 and 2280 as it's not stated. 

Thirdly, I need the GFX card for Photoshop/lightroom, so how do I ensure that card is running and not the other card. I'll probably be adding my Acer 27" monitor as well.

What do you suggest for all my issues?