A free program for Android, by Star Teem Dev.

A File Miner is a  strong file recovery program that can help you locate files that are concealed on your phone. File Miner is totally free and simple to use.

Features of the app:

Deep search. Find files in the cache, temporary, and hidden folders.Intelligent file recognition. There is nowhere for temporarily deleted items to be hidden because all widely used documents, photographs, movies, and audio may be identified to recognize different file formats.Protection of privacy. Deleted images, movies, and audio can be seen and chosen for recovery.Easily recover deleted files, including documents, photographs, movies, and audio.Support exporting to external public folders while viewing recovered filesPut your crucial files in this file vault so they can’t be destroyed by accident.