iFile File manager for iPhone is the only available iOS File Manager app. It provides users with access to the iOS file system and allows managing files.
To download iFile file manager without jailbreak, you can use AltStore, TutuApp, and Cydia Impactor, which are third-party stores. These apps provide a simple way to sideload .ipa files on ios devices and bypass apple restrictions.
iFile is the best way to browse the entire iOS filesystem on your jailbroken iPhone or iPad, with supports for viewing all file types, including images, documents, plists, and also installing .deb packages.