Originally Posted by PeterT
Can you share what Kobo model and what firmware?
How is the delete being done? from the desktop or from the Kobo itself?
Are you just using Explorer or calibre?
By the way, I am using Calibre to generate the epub file. I also tried to use Calibre to send the file to the devices. Sending through Calibre causes the same problems as drag and drop.
Deleting was performed both directly from the device, and using the operating system (rm in Linux and erase in Windows). I didn't delete through Calibre, since it says that it cannot recognize my KOBOs recent software updates.