CXR - Save Multi-Layer .EXR

I want to take advantage of the portability of the .CXR format, but running into some issues with saving multi-layer .EXRs for the OpenEXR format. I’ve spotted a few threads addressing this issue, but the workarounds are not working for me - as I understand them.

Short video documenting the process (see below); watch x1.5 speed. I appreciate any advice the forum has to offer, thanks :smiley: