Is there a way to trace multiple keyframes in Adobe Animate?

[defaultpqvcoz1tvp6n]

I have over 100 keyframes I need to trace and delete the background. Is there a way to select and trace all of them in one go? When I select them all with onion skinning on, trace is no longer an option. 

[Nick Gioia]

Yeah, I don't think you can do that many frames with onion skinning. But duplicate the frames over and over and just modify it as you go.