Keep the native format

I want to keep the native format of the file and do not want to convert to onlyoffice or editable format. I just want to download the file.

Onlyoffice internally works with Microsoft Office Formats (with great compatibility), so it converts all other document formats into OOXML. If you want to download them, why not go to the “…” menu and select download?

another solution: use the possibility to Open a Document Using WebDAV over HTTPS of LibreOffice