Hey @Noam Huri Racheal from the support engineer team here 

At the moment, Fin only supports content sync from a URL, not from uploaded files like images, video, PDFs or CSVs. This includes files that are embedded or linked on your Help Center page. Where possible, we've found that the best workaround is copying the information from the file into the body of a Help Center article. That's a great idea, though, so I'm happy to pass it along to our Product Team!

@Noam Huri You can also create snippets of content docs] where you can paste in text content, and just today we added the ability to import pdf’s for Fin. You can easily copy/paste into a snippet and test it out to see how well it works. We’re adding more support for different content types all the time!