I don't think the RAM can be upgraded. But you should take this with a grain of salt considering how I wasn't able to find any information on how the RAM can be upgraded, and I am really going off of the assumption that Samsung has begun to make it so the RAM is soldered directly onto the motherboard as the Galaxy Book3 has it's RAM soldered down aswell.
You can however check for yourself by opening up your laptop and seeing if there are any slots for RAM (which are those really wide ones that tend to be elevated off of the motherboard without being screwed in). But like I said I don't exactly believe that you can upgrade the RAM in the laptop without some amazing soldering skills.