Lightroom Mobile for iPhone - Can not export edited files

In the iOS Lightroom app in the “share photo” screen, “Save Copy to Device” and “Export As” both cause a loading screen to appear very briefly and then immediately disappear. If I hit the settings cog to the right of “Save copy to device” I can change my export settings normally, but when I actually go to share the photos that loading window pops up and disappears but no export happens. It works properly on my iPad (M4 13” Pro). I have verified I’m using the latest version of Lightroom on my iPhone. This issue has persisted for several weeks at least, probably longer.