How to use external editor

Hi, I'd like to use an external editor with the arduino IDE, but when I click the "use external editor" in the settings window, all it does is disabling the coding area, I can't modify the content, nor paste code in it.
Can anyone guide me on how to actually use an external editor with the IDE?

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Open the same file as you loaded in the Arduino IDE with your external editor and edit away. After saving the file using your external editor and clicking verify/upload in the IDE the file will be loaded from disk again and compiled.

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Thanks for your answer :slight_smile: