Quote:
Originally Posted by JimmXinu
Ids cannot (or at least IMO should not) be copied because each source book has different Ids and calibre will only let a book have one isbn id, one url id, etc.
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There was a change recently to allow multiple ids of the same type. For most identifiers, it needs support from the metadata source plugin, but for URLs, you can have "url1", "url2" etc. So, you could take all unique identifier types plus the identifier from the first book and render the rest as URL and add them.