I still have problems to get this to work: I have marked all documents that I want to have on my device as personal, but still the unmarked ones are showing up in the songs and are being copied to my devices after a local data reset.
You will see all the documents that are marked as personal for you, or not marked as personal for anyone.
What if I only want to see lyrics/chords (e.g. singers) and no documents at all?
You will see only the lyrics if all the documents are marked as personal for someone else.
There is no way to hide documents from yourself, only to hide them from others by marking them as personal to yourself. So one way to set this up is to attach documents and lyrics in a sequence so that any documents used only by one person appears first, then the shared or default document appears last. Then the people who have their specific documents would mark them as personal, hiding them from everyone else, and everyone else would fall back to the default at the end of the list.
The limitations of the current system are that a band leader can't select specific documents each band member (it is up to the band members to mark their own documents as personal), and you can't share documents in groups (a personal document is only seen by one person). I plan to address these limitations in a future update. I already have the structure in place on the back end, I just have to figure out the best way to present the additional options in the interface.