Cover pic added in Calibre don't show up on device
I have some epubs and pdfs to which I added cover pictures in Calibre.
These files don't have their own cover pictures (i.e. the first page being the cover page).
For the files that have a certain picture occurring as the first page in the file, the cover displays.
But for the ones where I added the cover in Calibre, it doesn't seem to work.
What could be going wrong?
My device is IREX 800S and I have the latest version of Calibre.
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