How to add more than one files in a Package

Are the documents that you're trying to put in a single package related? Or do you need to be sending them in different packages? To add a second document to a transaction with the .NET SDK, you'd simply need to make sure all signers were defined (.WithSigner()) and then define both documents (.WithDocument()). From there, to have one signer sign one document and the other sign the other, you'd just set up the signatures (.WithSignature()) for each document to point to the appropriate signer. Please let me know on my first question and I'll provide sample code.