Project thumbnail renders in low quality

Hi there.

I’m having problems with the quality of my thumbnails. I design them in a 1600x960 Frame but when I set them as thumbnail it renders a low quality version of it:

The text layers seem fine, but it’s the mockup that is looking bad. Like it’s not fully loaded. Is there a max file size for thumbnails? Or am I doing something else wrong? :slight_smile: