Are Infinite Upload Cloud URLs Added to Each Image?

Yes, Infinite Uploads rewrites every image URL on your site. There’s two sifferent ways it does it:

Any existing uploads on your site that you had before you installed Infinite Uploads is synced with our cloud storage & uploaded to our cloud. Once synced, uploaded & enabled, Infinite Uploads uses filters to dynamically override the existing links to media on your site. We do not modify the database. 

After Infinite Uploads is synced, uploaded & enabled, all new media uploads are sent directly to our cloud storage instead of being saved on your local server. When you add these media files to your website (e.g., in a post or page), the Infinite Uploads URLs itself is saved to your database as usual, as is typical behavior for WordPress & page builders. The media files are served using their direct Infinite Uploads URL as the source, ensuring faster delivery and reducing the load on your server. In this case, there’s no need to override any links because it uses the Infinite Uploads URL directly.