How do you get new Materials?

Hey. I done 4. LoA mission and I researched sniper. When I wanted to make it, it asked me tons of alien materials. But I did not see them before. Any idea?

Need to build and launch probes to find the sources and sites to refine them.

but I don’t have that kind of things. Which researches do open them?

It will eventually show up. I think certain main game objectives need to be done to unlock the next step.

bah I saw the building now. I always forget to make the buildings. Cybernetics, training and now this…