RAM can be upgrade to 2x16 =32 G [URL] You can have one M.2 and one 2.5" drive in the system -- make sure the mounting hardware (cable, bracket, screws) are in the system before buying, or you'll  need to order from Dell.    
I have a Dell Inspiron 15 3585 from around 2019 (Ryzen 5 2500U model). I've noticed that, even though I have 8GB of RAM installed, I can only use 5.9GB because my iGPU takes up 2.1GB. Is there any way I could upgrade the RAM inside the laptop, possibly increasing it to 12GB or 16GB? Could I also add a HDD to the vacant 2.5 inch drive bay?
Can the RAM on the Inspiron 15 3585 be upgraded?