|
The .opf and .jpg files are not MEANT to be transferred - they are part of Calibre's internal working.
As I said eaerlier the only reasonable reliable way to get a cover embedded in a file is to run a conversion (even if it is epub->epub). However if you do that it is always a good idea to ahve kept another copy of the file outside calibre control in case the conversion has undesireable side-effects on the layout (although this is rare for epub->epub conversions).
Note that there are other manual ways of updating the cover for epub files without running a conversion, but if you are not used to calibre then the conversion is the easiest one to try.
|