Stacks only work within the same folder
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Yes I see now.
Wow that seems crazy.
I organise my folder on shooting date then place.
I wanted to work on collections independently of the folder structure.
I want to stack similar images from different shooting times
(i.e. folders) and then choose the best image from the stack.
I hope Adobe change this in the next release. I can't see
any reason for not allowing stacking across folders. It seems
opposite to everything lightrooom is about? Oh well: sigh