Android App to make OTG USB Host mount a connected MTP device (eg: phone) as mass storage. -- 3

I need you to write an app that will allow a USB OTG host device (eg: Android Tablet) to browse and read/write to any mobile device (eg: MTP - phone/ tablet) that is connected via USB. The app will make the MTP device appear as a typical, mounted mass storage. The app will be installed on the OTG Host device and allow it to browse (eg: read/write) to the connected MTP device's storage. There are already many apps available that will mount USB device (eg: USB HDD, USB flash drive, etc) as a mass storage device. This app does not require that functionality. It must mount and permit access to the MTP device storage (eg: mobile phone/tablet). The app must identify the device and automatically mount the device to a user define-able location (eg: /sdcard/storage/User1/). The app must be able to automatically un-mount this storage when the MTP device is removed - without errors and without affecting other USB device/storage. The MTP device must be browse-able by any standard Android file explorer/apps. The app (and/or service) must not slow the file browsing or transfer speed (or any other operations on either devices). Simple material design. Very lightweight and minimal resource footprint. To be considered: 1. Respond appropriately - Any generic application will be deleted immediately and set to ignore. 2. You must provide at least one relevant example of similar work. 3. Experience with publishing apps to Google Play is preferred. 4. You must be able to demonstrate a working prototype.