Hello, I want to implement functionality that will save documents to

Hello, I apologize for the late response.

I created a rule that did the following:
Since we store document names in the DB, I pulled back all relevant document names.
I append the list of documents existing from the DB to a list of documents I'm trying to upload.
I loop through each document, updating that list as I go through. It checks if the document I am uploading matches the name of a document in the DB. If it does, then I update the name of the document to DocName_1. It then checks if there's a document with the name DocName_1 in the DB, until it is the maximum number.
It then continues onto document two.

It's quite complex, but it just requires some filtering and using a rule that actually calls itself until the name is what you need.

Let me know if you need any more help.