Upgrading computer's system memory

Our computer in Davao has a little memory space,so my family there couldn't put lots of photos and videos.Unlike our computer here in France,we have a very huge system memory.We can put big files and can store lots and lots of videos and photos even in their greatest resolutions.Since we put a lot of vacation photos and videos when we were there,my family noticed that the performance of the computer is getting slow.I told them that they should upgrade the computer's system memory.Maybe the memory space is almost full and that affects the computer's performance.

I told them that they have to contact their computer technician and buy a new computer memory.Hopefully the computer's speed and performance will be alright once they upgrade the memory.