// Getting links to proof images.
editor.getProofImages({maxHeight: 720, maxWidth: 720, pregeneratePreviewImages: true})
// If the links to proof images were generated successfully.
.then(function (result) {
// Get the links from the promise properties.
proofImageUrls = result.proofImageUrls;
})
// If there was an error thrown while getting links to proof images.
.catch(function (error) {
console.error("Getting proof images failed with exception: ", error);
});