Drag and Drop fails.
After deleting a book from my Kobo, I fail to drag and drop and add it back. When I eject the device, and check, the book does not show. I connect the USB again, and drag and drop the book a second time. After a safe ejecting the Kobo, the book is there.
I can repeat the experience may times. The result is always the same: The even drag and drop do not work. The odd ones work fine.
The problem is that I am editing a SAT preparation book. I need to delete and add the book many times. Repeating the drag and drop twice is a nuisance. Calibre does not make a better job. Any hint?
By the way, I work with more than one Kobo device. This means that the problem is not with a specific device.