I am using SharePoint Online site.
Some months ago I created a lookup column in document library [A] that referred to another document library [B]. This was the best option I found to be able to refer attachments to each documents in [A], using in [B] a field that is filled only for folders and not for documents.
It was working fine, when clicking on the look-up field, it used to give the possibility of checking the documents directly in a pop-up window or to open the folder in another view.
Since a couple of months this doesn't work anymore, now when clicking on the look-up field, it opens the "Properties of the folder" (that means just the name of it) and doesn't show the content of the folder itself.
What's changed? How can I solve this?