There are two different workflows - depending on if you are using Standalone or not (not all the plugins work with the PBR metalness material). So on standalone, use the Octane (disney) export and have your project be in a metalness workflow. If you want to use a specular workflow, use Octane (sRGB) export. In my experience, plug all the maps in with a gamma of 2.2 except the roughness map, that needs to be gamma 1. There is a lot about this on the group in Facebook.
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