Why does my AI file turn into a Bitmap when I import it into CorelDraw 2018

I have a subscription to Adobe Stock at work but use CorelDraw 2018 for my designing tasks.  Some AI files I download from Adobe stock are vector images but when I import it into Corel it's a Bitmap.  I though it was the file but I had someone open the files in Illustrator and it's a vector with no bitmap on any layers.  How can I import without it turning into a bitmap?