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kiwik - MR can host images and it will display thumbnails, in the Advanced dialogue click the paper clip icon, add images, the images then will be available in the paper clip menu to insert into post, any images you don't insert will be attached at the end of the post.
Can you post the text of the error - use the Copy to clipboard.
OK - in part, this answers something I asked earlier '
Can kobo's be used without any of the optional kobo plugins?' - the question was directed at davidfor or PeterT, I don't think I got a simple yes/no answer, but that's bye-and-bye.
Hopefully we now have a condition that is repeatable and diagnosable by the kobo experts. I'm not sure I've ever seen a kobo, so one of them I ain't
BR