Use APKPure App
Get Share To Internal Storage Lite old version APK for Android
Save content on your device by tapping "Share".
From time to time you just want to save something on your phone by tapping "Share" button in some application... Isn't it?
This application is made exactly for it.
Beware, there is no launcher icon. It will only be visible in the application list to share with.
Depending on your Android version, you can save directly to the device file system or via Storage Access Framework or both.