As I metioned on the ticket
You can already do this. Simply hold down the ctrl key and select
multiple files. right click and choose export files, and choose a folder
to export them to. Then in the other editor instance select "File->Import
files into book" and choose the previously exported files. Granted, this
is a little more work than drag and drop, but not by enough to make it
worth adding a separate feature for this.
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