Send Clipboard to a Background App?

Hi, everyone!

I’d like to copy something to my clipboard, then have it sent to an Excel spreadsheet in the background. Is there a way to do this, preferably with Keyboard Maestro?

I just purchased Keyboard Maestro 8 to use Send Keystroke to Background, but it doesn’t seem to work with Excel. I also know that Drafts for Mac has a Capture Keyboard shortcut, but that hasn’t worked for me because I want it to append to the same Draft, not create different Drafts with each clipboard.