Devices tab not showing

Hi, I eventually solved it for my KOBO libra 2 after months of frustration:

- Download book (.acsm link downloaded) from your community library (or wherever from) to computer

- Use provided usbC cable (Whether the provided one or not seemed to make a difference - don't ask me why, I see no reason why one usbC cable should prove different to any other, but this actually appears to have been my main issue!). 

- When a window shows on e-reader display: Chose to connect (to computer). Kobo reader then becomes visible as a unit in Adobe Digital Editions - hopefully! (Sometimes, I have had to take out cable and repeat)

- Go to File>Add to library (top left corner) 

- Choose Adobe Content server message (down right)

- Choose your.acsm link (the one you initially dowloaded) and open. Book is downloaded and can be found in your library (under All items).

- Drag book from “All items” (where it is automatically placed) and drop onto KOBOeReader. Now book you can disconnect and the book should be on your reader.

Good luck!