Copy/Paste function not working

Ever since I started learning Webflow, I have been unable to use the Copy/Paste function. It doesn’t seem to matter what browser or computer I am using. I even tried making a new Webflow account. No good. I can’t copy/paste within a project or between projects.

This is true regardless of whether I am using the keyboard shortcuts or the right-click menu.

I am probably overlooking something really obvious, but I’ve watched all the tutorials and read through every forum thread I could find - nothing has clicked.