Document Structure - Automatically attach Documents in Consists of Tab to Parent Document

Object Connection Transformation cannot do that, it's not how it works. Object Connection Transformation relies on documents being attached (as under Attachments / Documents) to "some other object", and defining a rule to "find that other object". In the case of document structures, that's not what happens. The child/sub documents are not "attached to" the parent in the same (technical) way that a document is attached to, say, an engineering part, or an invoice, or whatever.

You could of course install a clever custom event and event action that in some way mirrors/replicates/duplicates the Consists Of documents as being attachments to whatever object is relevant here. So, the moment you connect a child document under a document, the event would make sure that the same child document is also attached (as in Attachments / Documents) to the object.

Developing that is left as an exercise to the reader 🙂