We have found that setting up the LW Render Properties panel in such a way to MATCH what is going to be saved by Octane is needed when we render with network LWSN.exe with render manager. Render manager is looking for the native LW render properties so it knows what will be saved...but Octane is what is actually saving files.
Attached is a screen shot of what works for us. Notice in NATIVE dialog we add the _Main which is what OCTANE will add at render time, but we don't include that in the name on Octanes side....it's a mess but it works everytime thus far.
What would be nice for us is to allow JPG saving from Octane Render Passes, and even better integration with native dialog. That way Octane info comes directly and entirely from the Native Render Properties panel. Right now that is not the case. There is a checkbox to use NAME but that actually has a bug and adds the _Main__Main to the names saved...messes up our render manager looking for final frames.
Hope that all makes sense to you and Juanjo, for a future update.