The PMC kernel does not work with the denoiser. Which is why it shows up grey. The normal beauty pass should work.
You can select the beauty pass in the top right of the octane viewport.
I cant save the rendered image from the Octane window in UE4.24.
If I save a PNG it does show up in the Windows Quick Assess folder, but when I try opening it I get a message that the file does not exist. When I look at the folder where I saved it it is not there.
This is very odd. Can you save to a different folder? Does this also happen when you are not using the PMC kernel?
Another issue is that when I re-import assets to UE (from SketchUp using DataSmith) the changes are not all updated to Octane. I have to close UE4 and reopen, and then restart Octane to get the changes updated. Or is there another way?
Smoke and fire is not working, but that probably just isn't implemented yet?
Annoyingly some of these asset re-imports cannot be detected. Reloading the level should work. Also when it comes to textures and meshes, you can try to press the eye icon in the scene outliner on Actors that use them.
I hadn't tried the Cinematic Camera with Octane before. I can not figure out how to set the focal point. When I switch Camera Mode to Viewport I can set it in the Octane viewport again... Is that a bug, or just my limited knowledge of Octane and UnrelEngine?
When you use "selected camera " as the Camera Mode, the focal point should be copied over from the unreal cinematic camera you select in the "Selected camera" box.