I'm a total noob, but slowly and surely starting to get this. My main goal is to play Gamecube backups. I figured out how to convert Gamecube ISOs to proper files using the TeconMoon WiiVC Injector. Tried to load four backups onto my SD card in the install folder.
Put SD card into the Wii U, ran the WUP Installer channel, selected three of the game files to inject (I still have my "hbc" folder in the "install folder", so this along with just three of my four game files were visible in WUP Installer). Pressed install to my external USB hard drive (already formatted by the Wii U). It installed the first gamecube title to my USB drive, but now for the rest of them when I try to install in WUP Installer, I get an error that there is "no USB storage attached." This
https://i.imgur.com/Ugcxmhl.jpg
Why was it able to install one gamecube game, but none of the others? I was under the understanding that you can use the same external USB hard drive for the Teconmoon injects as the other Wii U injects.
On a related question, is it safe to delete the hbc, WUP Installer and other folders from the "install" folder on the SD card after they have been loaded on the Wii U vi WUP Installer? Is there only a limit of 4 files that can be displayed in WUP Installer at the same time?