Why we need this app? One of the biggest changes of Android 11 is that all apps targeting 30 can only access its' private folder. In the future, all updated apps are subject to this restriction. However, some apps do not give users a good experience. For example, some chat apps, save "files received from other users" to their private folder. In the future, private folders can only be accessed by the app itself, and other applications (including the file manager) and the file selector of the sys