how do i do it?
To clone.a keyframe, you can select the frame with the mouse and then copy/paste! In the test branch, there have been a few bugfixes that will smooth this process out.
You can use either ctrl-c/ctrl-v OR the copy/past buttons on the toolbar to do this.
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I can’t do that on Windows 10 :(
Hello @random, welcome to the forums!
Another way to copy and paste a frame is to select a frame, and use these buttons to copy or paste:
Neither worked for me 
Not sure why this is happening, maybe it’s a bug.
just do a copy and paste as you do in other PC applications. Press (ctrl+c) for copy, the move into a new frame area, click on it and do paste (ctrl+v)