How to assign several albedo maps to one mesh?

[fengkan]

I have one mesh with three UVs.

How can I assign different albedo to them?

I tried adding three materials into the material array, but they apply to the whole mesh.

Please help, thank you.

[fffMalzbier]

With the default shaders the rule is one UV layout for one mesh.
You can split the mesh into multible submesh in the modeling software so you can add one material per submesh.