We changed up how this works for Toolbag 5. You can set the UV channel for the material in the Texture panel.
If you need different maps to use different UV channels, you can do that with layered materials. There's a ton of additional flexibility in this case too, you can use blend modes to multiplity, overlay, etc multiple maps on different UV channels. Each layer can have different UV transforms and so forth. You can use this to build really complex tiling detail (detail normal etc) effects.
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I too have an asset with multiple UV sets and i need to tell marmoset to look for the same for diffuse, spec and normal.
Thanks a lot.
If you need different maps to use different UV channels, you can do that with layered materials. There's a ton of additional flexibility in this case too, you can use blend modes to multiplity