I maybe missing something but I have a 320gb library & wish to reduce the size - dramatically. Reading the article of the same name I have followed the instructions, but dont seem to be able to delete the previews. I have tried time & time again but they are still there & my library refuses to reduce in size. I have unticked the required item in preferences & unticked main previews in the gear menu & then tried to delete all previews.
Is there an update to the instructions or an item I am missing?