Hi koeniee, and welcome.
Multi-device sync only works with epubs purchased from Kobo and loaded onto your Glo via wi-fi or the Kobo desktop app. However, you do not need a permanent wifi connection. The book will be downloaded to your phone, or tablet, or Glo and you can read all you like with wi-fi off. Only when you turn wi-fi back on will your bookmarks be updated though.
It is commonly accepted that Kobo does not do multi-device sync with sideloaded books due to privacy concerns.
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