Do not slam the lid shut just yet.
: Close unnecessary background applications and use "Best Performance" power modes to maximize the efficiency of your existing RAM. Check Availability Crucial System Scanner Acer Spin 3 N17w5 Ram Upgrade
The chipset (Intel Kaby Lake-R) officially supports 32GB total. However, due to the soldered component, your maximum is: Do not slam the lid shut just yet
Do not buy DDR3 or DDR5. Do not buy ECC (Error Correcting Code) server RAM. Stick to standard DDR4 SODIMMs. due to the soldered component
Use the Crucial System Scanner or check your Task Manager (Performance tab > Memory) to see if "Slots used" shows "1 of 2" or "1 of 1". RAM Specifications to Buy