I messed up a screen and tried to export and import a screen twice
On both occasions, it exported the wrong screen.
Or am I just being stupid, again?
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Kodular saves the screen automatically. Then the exported screen will always be the last screen saved.
So when you import the screen again, it will be the last screen saved.
Hope this helps 
Maybe, but not here. The file name was right. The content was wrong. AGAIN. 4th time!
Einstein would say I was mad by now 
Generally exports by changing the name: project.aia
project (1).aia
project (2) .aia …
talking about screens (ais)