Is there a special link to the document?

The good news was that neither did anyone else.

This approach minimizes potential friction while still providing sufficient time for them to make arrangements.Using certified mail for official notices ensures legal compliance and provides a paper trail for documentation purposes.

They're the intermediaries for a reason... they don't record the deed until the funds and all of the documents are properly filled out. 

Another thought is to find some previous guests (like myself) that are still around, or still alive, and bring them back some years after their previous show, to kind of document their RE journey.

Page 7 of this document has a rough outline also. 

https://www.biggerpockets.com/...12 Frequently Asked Questions (And Answers) About DSCR Loanshttps://www.biggerpockets.com/...8 More Commonly Asked Questions and Answers to DSCR Loanshttps://www.biggerpockets.com/blog/eight-questions-and-answe...What Documents Do You Need for a DSCR Loan?

The only reason you should not enforce action is if its contrary to an applicable law or regulation...Here is another section from Seller Covenants:Seller agrees to honor requests for execution of endorsements of Mortgage Note from Seller to Buyer if made within thirty (30) days following the Transfer Date, after which Seller shall not be obligated to honor such requests.So if there was an issue with a prior document, after 30 days they can tell you to go pound sand - and based on court documents, this has happened. 

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

Just go to Resources, Owners, then look in the documents section.