[Quoth]

Originally Posted by aschiller

Thanks, for the hint. Is there a possibility to preserve the original image reference (e.g. https://www.example.org/image.png) instead of using the downloaded png?

I use RTF to export from calibre for wordprocessing. I'd only sometimes copy & paste into a text editor to remove formatting.

RTF is very portable and maintains most of the ebook info including images.