[ashlar]

And what happens when you bring up the movie information dialog and select 'choose art'?

From "inside" the movie versions "folder" the contextual menu does not bring up either info or manage options:



If I press I on the keyboard, Kodi asks to confirm what movie I want info about:



Once I do that, I access the same Info window that I can access when accessing contextual menu from the regular list of movies, by activating it on the movie versions entry (in this case the 12 Strong entry). From there, I can access the regular Movie Versions window and if I go for "Choose Art", select, as an example, "Fanart", this is what I get:



I hope this is clear.

Edit: to clarify, if I select Information on the Movie Versions (12 Strong in this case) entry in the general movie list, I can then choose art but that's only for the "containing folder", not for the single versions inside.