Inject a loadiine save on usb or internal memory :
Just copy the game save folder from your SD card to your desktop.
Rename it with the game ID. ( 00050000-XXXXXXX )
Inside the save folder you have 2 folders :
Rename folder C to common
Rename U folder to 800000X where X is the wii user account number ( if you only have one account on the console it should be 1 )
Download the latest saviine release:
https://github.com/Maschell/saviine/releases
Place the wiiu folder on your SD card
place the server folder on your computer
Put the save in the inject folder of the server directory.
Open a command prompt window and type ipconfig. This will give you your ip address v4.
Enter that IP address V4 on Saviine by using the DPAD then press X to have it reboot to the home menu with saviine patches enabled
Run the Saveiine server with INJECT argument
Launch the game.
The inject prompt will appear on the computer asking you to inject the save.
Choose the save and inject it.