There is an issue with the alert system where the alert keeps spamming, even when you arent touching the button at all. Text will still be copied with one click, but the alert system won't be added back until a solution is found.
Copy Text is a new feature in V11.9, where you can enter text into the field, press one button, and then the text is copied.
To use it, scroll down to the field, and change the text to whatever you want. Then, click one button. That text is now copied. It's as simple as those three steps.