I don’t think it’s really necessary with the DropBox and Google Drive integration. I picked Maybe, because, why not? I use Send to Kindle every day to send the morning puzzles to my Scribe. I also send epubs to it from time to time. Any puzzles or suchlike I want on my Libra Colour, I send using DropBox. And other files I transfer across from Calibre, after using tags to sort into Collections.
I guess it would be useful for people whose Kobos don’t have DB or GD, and who don't want to do Nickel-based workarounds, or who don’t know about the workarounds.
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