I can't reproduce your supposed problem...
First I modified your SKP a little - all of its the faces are 'inside out - i.e. the back faces are NOT inside the object, but facing outwards - use a Style with a distinctive back-face color... To fix Select a face, Reverse, the Orient - all faces should now be the right way round...
Your default front-face is pure-white too - which doesn't show up too well against the default Octane 'white' background'...
Then I Exported with Camera AND the image's Resolution [so the image a manageable size in Octane] AND the SKP's Lighting so it's at least 'shaded'.
In Octane I see the view I had in SUp rendered in Octane.
I move the camera position in Octane.
I save the Octane's OCS.
I modify the SKP - add geometry etc...
Next I re-export the SKP, but I un-check the 'Camera' option.
Now in Octane I see the view I last had in when I saved the OCS... BUT any other changes to the SKP are seen.
So the camera exported OK the first time then it didn't the second time - as expected.
I adjust some material settings and change the view point again.
I save the OCS.
Next I re-export the SKP... but this time I check the 'Camera' option once more.
Now the OCS render opens with the camera re-set to match the SKp's camera again, however, the changed material settings in the OCS are used as these always override the SKP's exported values...
Can you try these steps and report back - I can see no problem with the steps I outlined