K only is missing

[MickRose]

In Publisher Beta 1847 on Windows, when I select an image the "K only" button is missing. On 2.1.0 it is between "Replace image" and "Fill".

[HCl]

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[MickRose]

Thanks @Return - it was an RGB document and making it CMYK did the trick. The K image still won't print but that's a different matter and I have reported it.