Smart folders are a bit like virtual folders - they are based on a search criteria or similar (for example, file type). So files don't really reside under a smart folder, hence they can't be moved or added to a smart folder. For example, if I created a smart folder based on file type .pdf, it wouldn't make sense to allow me to add .jpg files to that folder. Hence it also doesn't make sense to allow me to remove .pdf files from that folder either - otherwise the whole logic of the smart folder would be broken.
Let's try another example. Imagine you had a document type called "contract" and a smart folder that showed all "contract" documents. To remove a certain contract document from that smart folder, you would have to change the document type to something other than "contract". In order to remove or add files, you have to do that in the physical folder - so, if you want to add a new "contract" document, you would have to add the contract document to a physical folder and it would then be visible in the "contracts" smart folder because of it's document type.
Digital Community Manager, Alfresco Software.
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