A final update regarding Kirby plugins - at least for now.
My Pexels Field plugin was released in a new version for Kirby 4 on Friday. I've adapted the design to the new panel and optimized quite a bit under the hood. Downloading should now work better and automatically update the file view in the panel.
Additionally, there is now a function to set a default size. So far, the original image was always downloaded, but it is often very large, and such large images are often not needed on a website. You can now set the image size and save some space.