Files app can be useful for the one who works with network file servers on Mac, Linux machines or PCs. When it is connected, users can open the files and store them to the shared location. If you want to connect it too, then you are on the right post. Read the blog to get the idea of connecting SMB Shares from iPad or iPhone with the Files App.
Source : https://johnnypotterblogs.wordpress.com/2019/12/24/how-to-connect-smb-shares-from-ipad-or-iphone-with-files-app/