I know I asked about keynote files before and I also read a few threads about pptx files, but I’m not sure I understand it.
I did once, with little lag, import a powerpoint made by another person on a windows laptop. But I cannot repeat the same with something that originated in Keynote even after exporting a pptx, opening in powerpoint for mac, and resaving it from powerpoint.
Is the only way to export images and use those?