Importing object with animation, crashing ember gen

Hi so I have tried to import a simple rectangle that has a abit of animation on it litterly just going from almost flat to sligther bigger, every single time I try and import it into ember gen it crashes 2 seconds later before it has uploaded it. i have tired changing a few settings while exporting but nothing is working

Hi can you share the file with us here? I can take a look to see if I find something.