How to assign documents to a product when its created

Create a business rule with a "product is created" trigger. Then set up conditions that will check what kind of documents that should be attached. In this example the attribute Article us checked.

If the attribute is a type we know needs a document attached we can update that document using the update attribute action. In this case the Documents attribute is updated.

The "else" case is left empty so if future products that does not fit into the other categories are created they will not be given documents.