Can't crop header photo after creating child theme

I’m working in my newly created child theme.

I noticed when I looked at my child and my parent themes, side to side, that my header photo in my child was cropped wrong.

When I go into my media library, it is there, but it is attached to a another post and I’m not allowed to crop it.

I DID find the file in my cpanel files, but after copying it to my child theme file, it still never showed up in my dashboard when my child theme was activated. Did I do that wrong?

I also need to mention that I have no idea where the original file is at, because I originally downloaded that photo about 4 years ago, BEFORE my old computer crashed and I lost everything.

But like I said, I DO have it in my files in cpanel. Did I just not copy them to the right place?

Any suggestions?

Thanks!