Our app surfaces talk to an image engine on our infrastructure to process and resize images for different smart phone screen densities. Because of this the size of images are less relevant as they are delivered at optimum sizes anyway. However due to processing power and speed we do recommend that image urls are all 3000 pixels or below. The app surfaces will never need an image this large, so it gives you the option of still having a large quality image, but can be loaded in the apps and our infrastructure efficiently. We support both png, jpeg, and webp images. You can optionally include a '?v=' version integer so this can be used for versioning. If you do include this you can ensure images are reprocessed if the source image is changed on your servers.
{
"imgUrl": "https://your-wordpress-site.com/wp-content/uploads/2023/08/a-large-image-3000x2100.jpg?v=1691481892",
"image": "https://your-wordpress-site.com/wp-content/uploads/2023/08/a-smaller-image.png"
}