There were a few changes since then, right.
1. Have you turned on Adaptive Delivery settings in WP plugin settings — Advanced? It’s turned off by default (see below, why).
2. Uploadcare dashboard is changing right now and AD settings are not yet obvious, so go to your project Settings, Proxy tab, there you’ll find Domains. Add your website there.
This thing is tricky because every WP theme is different. Some (like default one) are compatible with plugins that change theme behaviour this way, other are not.. We have a new adaptive delivery JS SDK on our roadmap that might solve this problem due to different frontend architecture, but it’s not there yet.