Checkout Image Restrictions and Limits
Checkout has the ability to use any image type that Preview.app is able to open. This includes PDF, EPS, JPEG 2000, JPG, PNG, and PSD, TIFF, TGA, BMP, PDF, EPS which are converted to PNG.
The maximum file size for a Checkout image is 50 MB. That being said, the larger the images that are attached to your products, the slower your Checkout experience will be and the larger your database will be.
Please note that Shopify syncing does not allow all image files that Checkout does.