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This is due to some annoying security settings with most major browsers, which prevents anything besides textareas from getting clipboard data. Our editor is not a textarea, though it looks like one, probably because a real textarea cannot allow rich-text editing.
What do I do?
After copying the text, right-click somewhere in the editor. You'll see the option "paste" in the context menu that appears. Click it. A dialog box will open. Paste your text into the dialog box and click "OK". The text will now appear in the box.
@polarkernel Is it possible to introduce a fix so that the dialog box appears even when ctrl+V/cmd+V is entered on the keyboard?