The OPUS setting "limit image resolution" changes the structure of how the visible images are stored.
Currently, if this option is checked, a single visible image is stored and properly exposed by opusFC. If the option is not checked, then each (unstitched) camera image is stored and exposed as an individual image by opusFC. Will need to check if the appropriate metadata is present in opusFC.
Related: stuart-cls/python-opusfc-dist#17
Thanks to Martin Kruezer for the report.