Can I get some help with an Epub problem?

A

AC Question

Epub problems

I create epub-files from .docx with calibre and sigil, and they open nicely in my desktop and other platforms. But when downloading them to my s6 they are changed to .txt ! When I change the file extension in the downloaded file to epub it works fine.
Any ideas?
jea .se/EBOK/DO I WNL.html
regards jea from sweden
 

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