[DoctorOhh]

Originally Posted by travger

I'd prefer the plugin. It opens the epub, inserts the cover and closes it again without bothering other files. With conversion there's more chances for things to go wrong, people here have mentioned that Calibre adds some code (maybe some forgotten/unnoticed setting...). I like to know the changes I make.

I agree, but if the Send to device feature doesn't embed the cover in the book there is a good chance the Modify ePub plugin won't work either since in theory they use the same code to accomplish this feat.