Yey, I figured out how to display 3D movie stacks in #ChimeraX, thanks to @dabiophysicist.bsky.social for the suggestion. My original tiff was not ome-tiff so you'll need to convert it first (do this with #Python), then adjust voxelsize in ChimeraX so the image isn't flat, record, and voila!
One drawback tho and unless I'm not aware of an alternative, it seems if you want to display a time series stack, you have to save each time frame as a separate stack before loading them into #ChimeraX. If you don't, it will superimpose all timepoints into 1 single 3D stack. This, #napari is better!