A properly made odt file can be converted by Calibre very well - convert to an epub format, which is what Amazon prefers. By "properly made" I mean that you have used paragraph styles throughout, with no formatting using the tool bar except the occasional italics or bold phrase. Use Writer's Heading 1, Heading 2, etc. for chapter headings, for example.
The reason for this is that Calibre will use the styles to generate good html with css styling. If your odt manuscript is formatted just using the toolbars to "make things look right", the conversion will produce a code nightmare. (This applies to ANY conversion tool you may find, not just Calibre.)
The odt converter is a bit on the old side, so conventional wisdom these days says save your odt manuscript with Writer as a docx file, just for the purpose of conversion. Don't edit the docx, just save it that way and convert, only because the conversion routine is a little better.
Even if you have used styles everywhere, the Calibre conversion will try and help make your book more readable: it will change it slightly. So you are going to need to edit the epub after conversion. This will probably be minimal, but will require you to know or learn some html/css ebook coding. The Editor can do this part very well.
Many thousands of books have been made this way for Amazon, And some of the folks you'll meet here are professionals at it. So give it a go, and ask questions if you need more information.
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