Instead of importing, try opening. If you did this already, did you look to see if Layouts were created?
Sometimes I've seen this blank file behavior and usually you need to just ask for a file saved to a different version, etc.
Have you tried opening it in another (viewer) app like edrawings?
I feel your pain.
Nattering nabob of negativism
2023 MBP M2 Max 32GM. MaxOS-Current