Nowadays, most smartphones come with built-in features to hide photos, videos, and lock apps. However, if your phone doesn’t provide this (hide/lock) feature then you may need to use third-party apps like AppLock, Vault, etc. to lock or hide your precious stuff.
But imagine if you uninstalled the app without unlocking your locked files or forgot the PIN/password of the app where all the files are hidden then what will you do? How you are going to recover the hidden files from the app?