Hello again.
I may have a slight hint why the issue arises : the folders I transferred are numbered, each having the number it had in the Calibre Library on the computer I used while away from home. (So numbers in the low 100s.)
Now when I transfer those folders to my usual Calibre Library, that goes up to many 1000s of documents, I am certain those "low" numbers are already "occupied" by other documents that were created on this home version.
But admitting this is indeed the issue, is there a way to solve it, and if so what would it be?...
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