Steps to recreate (OS X)
  1. Click the + tab to add an attachment
  2. Choose Enter URL
  3. Type url
  4. Press Enter
Enter will select the content you just typed. It should be the equivalent of hitting the OK button.
macOS 10.14.6
TheBrain 11.0.119

I've tried replicating this in our internal test version and what you are describing is not happening, so a fix is right around the corner. Thanks for pointing it out [wink]

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