I want a drop-down list here :
But the range is in another book called : sheet with range
I've tried to use data validation with "IMPORTRANGE" without success , making the following:
=IMPORTRANGE("https://docs.google.com/spreadsheets/d/1A8v4TEgibkesX729YcjEDn8RkcogutT_8pgIkggaBfI/edit#gid=0", "Hoja 1!A1:A5)
I get the following :


