Sorry for being late here.
There are no equivalents on Mainframe terminals for Alt, Ctrl keys, so using Send Control keys will not work.
The only way would be to use Send Hotkeys (the regular UI Automation activities) - make sure to point it at the real terminal window, not the wizard one.
Or, if these are supposed to be mapped to terminal functions (although it seems you want to go through clipboard so this may not apply), you need to check to what terminal function a specific shortkey combination is mapped to and send that function instead. For instance, if Alt+F10 is mapped to PF_CLEAR, you need to send “Clear” in Send Keys (or Send Control Key) activity.
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