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Thanks for your help!
I am still not fully clear whether it's an epub2 or epub3 format that my file is in.
I have used "edit books" and looked at the content.opf file. Does its existence confirm that it is an epub3 file?
The opf file has a line that says "<meta name="calibre:series" content="Die drei ??? Kids"/>", which I believe is a custom tag rather than epub compliant? Epub compliant would be "belongs-to-collection".
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