Android Question File manager - how to read / write on internal memory and other 'hidden' zones?


Licensed User
I would like to make a file manager, partly on Android and partly on PC
A big problem is that the Android app cannot read / write on many areas of the device
Especially on internal memory, it just doesn't go there
However, I see that some apps are able to do this, for example MyPhoneExplorer also reads the internal memory of Android correctly
The question is: if you want to create a file manager similar to MyPhoneExplorer, and assuming you always work with non-rooted devices, how can the app be able to read and possibly write in most of the Android memory?