Custom Values and Lookups cannot be Imported or Exported to Excel

I cannot Import/Export Custom Values or Lookups using the MS Excel add-in because neither appears in the artefact drop-down list.

There doesn't seem to be much point in having these worksheet templates if you can't use them.

I don't think this is version specific to Excel 2003/2007/2010+, but I am on Office 2016 and SpiraTeam v4.

Has anyone else encountered this?