Canva image issues

Constant Contact locks up every single time I try to to import a Canva image, even Canva stock images. This is so frustrating. Too many graphics on an image - you're out of luck...it won't load into CC. I just see the Canva logo spinning and spinning for so long that it just locks up and I have to cancel out of CC. Why have Canva if it's not a seamless integration? I have tried resizing images until they're so small that it's just not worth it.