How do I remove the blackness from the image?

I made a game and everything is fine, but there are only two images that do not appear in the final export and a black box appears in their place, even though I tried all the solutions?
How do I remove this blackness and why does the image not appear and this black square appear in its place?

are your images .png with alpha channel?

You probably need to delete the animation of that sprite and add it back in