By materials you're referring to mt5 or mc6 files, correct?

You can move those into any runtime that is part of your library. You can drag and drop them using explorer.

In explorer, the runtime looks something like this

You'll want to put them in one of the folders under the library folder. Materials is usually the go to one because it was created for that, but some find it easier to put it in one of the others because it makes more sense to them. I put my mat poses in the material folder so I don't have to look in 2 places for them.

Then make sure the textures (image maps) are in the texture folder.

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