Sorry, forgot to attach the test files.
#+title: ODT styles test
#+ODT_STYLES_FILE: ("odt-test-styles.odt" ("styles.xml" "Pictures/10000201000000A2000000B0A7D655E3F0A97ECF.png"))Place this Org file in the same directory as the accompanying file odt-test-styles.odt and export it to ODT. Expected result: the exported document has a picture of the Org unicorn in the header. The ODT_STYLES_FILE option is set correctly according to [[info:org#Applying%20custom%20styles][info:org#Applying custom styles]]. It references another ODT document providing the custom styles to apply to this document, including an image to be used in the header.
odt-test-styles.odt
Description: application/vnd.oasis.opendocument.text
