However, the free app “Shrink Storage” helps you solve this issue smartly with a trick. Firstly, the app completely fills the internal storage, and then reboot the phone. Then you need to remove filled storage manually using this App. How to use Shrink Storage?
Install the app from Windows Phone Store, and then follow below steps.
Open the app and click “Fill Phone Storage” Wait for the confirmation message Restart phone Select “Clean Phone Storage”
Note that, the result (gained free storage) will vary between phones to phone. Also, there’s no guarantee that Windows Phone will free up storage by this way. Usually, it does when you use this app for the first time. Download Shrink Storage from Windows phone Store.