Can't export to craft

The craft import page ask for a zip file but Friends and Fables only provides a cdf.json file for the project I want to transfer. I tried to compress the cdf into a .zip but it didn’t work. I am paying for craft, I’d like to be able to use it. This is quite frustrating since it’s the only project I want to work on and I can’t. Please fix it if you have the time, thanks.