I believe that send to device or save to diskwill do it.
I cannot check on calibre because it is busy doing database integrity check

This thread may help
https://www.mobileread.com/forums/sho...19#post1060419
https://www.mobileread.com/forums/sho...33#post1057733
The caveat is that you probably have to save to disk or send to device (with a folder being the device) then re-add books to calibre with get from filename only checked.
But maybe not.
Do one book and then when you have it how you want it it is simple to do the rest
Helen