I’m getting to the next phase of ePUB creation. My project now exports and with mtxrun —script epub, I can create an actual ePUB, but there are issues I need to fix.

One is the lack of a cover image. The command for epub creation works, but says:

(. /usr/local/src/ConTeXt/tex/setuptex && mtxrun --script epub --make "prd_book")

mtx-epub        | using specification file 'prd_book-export/prd_book-pub.lua'
mtx-epub        | the 'mudraw' binary is not present
mtx-epub        | cover page image 'cover.xhtml' is not present
mtx-epub        | saving dummy coverpage to 'prd_book-export/cover.xhtml'

I’m using in the env file:
\setupbackend
 [export=yes]
\setupexport
   [title={Chess and the Art of Enterprise Architecture},
    author={Gerben Wierda},
    firstpage={9789081984058-CoverFront.jpeg},
   ]

So, what seems to be ignored is

\setupexport
   [title={Chess and the Art of Enterprise Architecture},
    author={Gerben Wierda},
    firstpage={9789081984058-CoverFront.jpeg},
   ]

What am I missing?

G