AI that serches multiple PDFs

Hello everyone!

As a novice with Obsidian, I ponder whether the program, or any of its plugins, offers AI capabilities that enable me to search for answers within my vault by asking questions in natural language. Specifically, can these tools process and understand information from multiple PDFs?

I have asked Gemini AI about it and it says there are some plugins and that can be done, however, AI is not always right.
I appreciate your answers!

I use DocFetcher – nice range (proximity) search available in it too.
Must index all files first.

Not Obsidian plugin, of course. And not AI.