Exporting asset mesh with full texture 5.3.2

Recently bought the hivemind bundle on humblebundle. I can access the assets but when I try to export to FBX or OBJ they only export with one texture. I tried following youtube videos etc with no luck. Can someone share a concise,complete method with me. Sorry to say I’m new to this and will need things spelled out if you would be so kind. Appreciate all the help I can get. I guess this makes me an asset flipper but I’m only doing it to have nice models to use as I learn to program in another engine.