[enuddleyarbl]

It looks like either dragging/dropping or adding from the clipboard will work and use the deDRM plugin. If I double-click on the AZW3 on my Kindle and let Calibre try to read it, it gives me a DRM warning. If I drop or Add it to Calibre and open it, it opens fine.

I don't know if there's a difference between the two methods. When I drag and drop, I get the following dialog:

"You have dropped some files onto the book [title]. This will add or replace the files for this book. Do you want to proceed?"

If I Add via the cllpboard, the dialog is:

"The AZW3 format will be replace in the book [title]. Are you sure?"

But, so far, I don't notice any other difference. It's not the fastest thing in the world to do (for 202 books). But it beats Adding them all at once from the Device and then copying all the old metadata to the new entry. I wonder if I can Add them all from the Device, sort in some way to get the old/new entries physically close, and drag and drop the AZW3 file from within the new entry to the old. I'll have to give that a try.

EDIT: Nope. Can't drag and drop entirely within Calibre. So, dragging/dropping the AZW3 from the Kindle via File Explorer to the Calibre Book Details panel or doing a CTRL-C and ALT-SHIFT-A (default Add from Clipboard) will have to do.