Thank you Sir,
It works, it takes some time to embed metadata of 50 books and I have thousand of PDF's metadata need to embed, I hope it won't freeze the program.
But I will keep adding new PDF to Calibre and modify some tags of existing PDF. How can I filter out those new PDF or modified PDF that need to have the "Embed metadata" tool apply again? One way I can think of is using the modified date.
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