getting files into iTunes apps-buggy

Can't seem to succeed on several attempts now to get a Keynote presentation into iTunes to sync over to my iPhone. I've got my iPhone connected, the apps column selected but iTunes will not allow me to scroll to see the app (Keynote) which I want to add in order to get it onto my iPhone. has happened this way with a number of other apps as well. I just can't scroll, which limits me to only the apps I can see but none others. Downright buggy I'd say. Version 12.1.2.27

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