Per this help page on Highlights, I should be able to highlight text on a page and see that highlight in the preview on the Raindrop desktop app. Even in the desktop app I'm not seeing the highlight UI as described on the help pages.
Unfortunately Highlights not ready yet. You discovered a hidden page :) Give me more time to test everything before release.
You will receive an email when it be ready
Per this help page on Highlights, I should be able to highlight text on a page and see that highlight in the preview on the Raindrop desktop app. Even in the desktop app I'm not seeing the highlight UI as described on the help pages.