I believe that Kobo has already showed their solution for Send-to-Kobo: other companies’ cloud drives.
I can save a book to either Google Drive or Dropbox and moments later download it onto my Kobo, or I can save a book to a specific folder in iCloud which Calibre monitors on my Mac and then download it using Calibre’s web server.
None of those options sync directly to the Kobo library as Send-to-Kindle does for Kindles, but they are all over-the-air solutions.
Without sideloaded ebook sync support, however, I personally see little utility for send-to-Kobo over the cloud drive solutions. I read a (legally purchased) sideloaded epub recently that I annotated on my gorgeous new Libra Colour, but it irks me that I’m one database glitch away from losing all those annotations, and they don’t sync to my Kobo Elipsa.
So I would personally rather see sideloaded annotation syncing before Send-to-Kobo. However, as was just pointed out above me, Kobo’s syncing leaves a lot to be desired. Never mind between iOS annotations and Kobo device annotations, even Kobo to Kobo syncing is spotty. The only reliable sync is last page read and bookmarks. Annotations are a dice roll.
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Spoiler:
Interesting discussion, even with the drama. I learned that Send-to-Kindle isn’t for their own formats (
https://www.amazon.com/gp/sendtokindle/). I barely use the service for my Kindle and just never noticed.
I learned that Quoth last used an iPhone 4S(!!). My iPhone 15 Pro is a bit further along the evolutionary path, but Apple’s iCloud services are still walled, it’s true. I no longer buy any Apple Books bc I can’t strip the DRM, but I find iCloud to be quite stable and useful.
And I learned there is a mysterious service out there called STK! It’s not steak, it’s not a mobile phone, and it’s not “Software for Digital Mission Engineering and Systems Analysis”. Or maybe it is. I don’t know. Those are the only solutions the search engine offers me.