So you Import sprite definitions and they still aren't showing up when you add them.
Here's how it's done. You download a software called Gimp. Most of you know what this is already. Download link: https://www.gimp.org/downloads/
First step is to open your image that isn't working File>Open>Your Image
Next, Image>Mode>Indexed.
This should make the image work.
After you do that, File>Export As>Set as PNG File>Save to Gani folder
To export it into your gani folder look for Graal>Levels>Ganis>Export
The image should ALWAYS be in your gani folder.
Then go to Graalshop>Import Sprite Definitions>Import the Indexed Image>Add Sprite Definition
After that, you should be able to see your image!
If it doesn't work, or if I missed something, post it, and I will edit my post!
Hope this helps.
If it is too confusing, I can make a video for you guys.
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This should work