Unable to Copy/Paste?

I get an error message when trying to copy and paste into Moodle™, or just cannot copy/paste. How do I get around this?

If you are unable to copy and paste into a text box using the right-click menu, you can use a keyboard shortcut as a workaround. On a Windows computer, Press Ctrl+C to copy the highlighted text, and Ctrl+V to paste it into the text box. On a Mac, Press Command+C to copy and Command+V to paste.