There was nothing interesting in that file that wasn't already publicly known. Likely it has just a fluff to help playing a victim (they even tried assassination attempt in it) and imply that Iran is working with Democrats.
There was the question of why Vance would work for someone he had called Hitler. His public statements are they here was convinced after Trump's first term that Trump was a good president.
In fact, there are private texts stating that Vance believed Trump's presidency was a failure. This was new information. It made it clear that he wasn't convinced by Trump's presidency.
It probably doesn't make much difference to most voters, but it is significant information.