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Long-touching a game image will provide options for looking for an appropriate cover image.
If you have a folder of images from another source you can import them into Dig from the “Manage system” menu.
What is this option actually doing?
I've a folder in my sd card with a bunch of covers. I imported them and now?
I still need to long-touch a game image and select them from my sd card.
I think I'm missing something here.
You need to update one by one. For example, I've a SNES Super Street Fighter 2 with fixed colors and a custom boxart for it.
First, long press on the game that has no boxart
Select the first option (boxart image)
Select "Your device"
Find the image on your device