In Sigil, you need to do that file name change in 2 steps. First to some other name (i use temp or anything else you want that is not a case insensitive match) and then to the CaseSensitive variant name you wanted.
FYI,
Many epub2 devs used blank spacer image gifs (and lots of them) to make whitespace changes that really could have been done more properly with css. Some scanners even created them.
Perhaps you found one of those? Try opening that image directly in an Image Tab, or external browser to verify if truly blank (ie. a spacer image).
Last edited by KevinH; 11-16-2023 at 05:08 PM.
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