expansions/autocorrects/pastetext

Yes, that does work, however it is not convenient to check/uncheck multiple times a day during the day.
I am trying to do something with the pastetext feature. I can get it to work for Solu-Medrol where "solu" is in the autocorrect and "Solu-Medrol" is a pastetext item in instant text.

For some reason, I cannot configure it to work for "CK" in instant text.