3 questions (I just inherited an previously establish org)

1) Can a document be used in multiple DDPs or does a copy need to be created for each DDP?

2) When migrating DDPs and I have the same document associated with multiple DDPs in the destination org does it create copies of that doc?

3) I currently have multiple copies of the same doc 1 for each DDP: I am desiring to clean that up if I can associate the same doc to multiple DDPs.

Sorry as I have a feeling these questions might be basic but my exposure to Drawloop is novice at this point & the person who used to manage these is no longer here.

Thanks,

Mike