The uploaded file is not allowed: epub-application/epub+zip - Joomla! Forum - community, help and support

hi,
i have problem upload "epub" file.

i've created "upload file" field in sobipro, when choose epub , save joomla return me error:
"the uploaded file not allowed type "epub - application/epub+zip""

i have tried "media manager" it's impossible.

you know problem?
can u me please solve?

thanks,
bye!

when inside media manager view, click options icon in top right. bring options modal window can white list file types upload.