LibreOffice Writer: How to link inserted images by default?

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http://askubuntu.com – I often have to deal with documents using multiple images -- as e.g. Howtos, short documentations, or even books with many examples. Always when I start a new document and insert the first pictures, they are embedded by default. I need them to be linked by default -- but could not find a suitable setting. Can anybody tell me where that's hidden? In other words (to be clear from the beginning): How do I tell LibreOffice to always default to link inserted images instead of embedding them? (HowTos)